Because vs. Because of – English Grammar Exercises for B1
You are 15 minutes late for a movie date and you are texting/talking to your friend to explain the reasons and ask for their sympathy.
Choose the best option (A, B, C, or D) to complete each sentence. Read the context carefully. Pay close attention to the words immediately following the blank to decide whether you need a conjunction for a full clause or a preposition for a noun phrase.
1 I am so sorry I’m late! I couldn’t get here on time ________ the terrible traffic.
(A) because
(B) because of
(C) because off
(D) despite
2 I missed the 7:00 PM bus ________ I left my apartment five minutes too late.
(A) because of
(B) so
(C) cause of
(D) because
3 We are probably going to miss the movie previews ________ the long line at the ticket counter.
(A) because of
(B) due of
(C) because
(D) despite
4 I had to walk all the way here ________ my car suddenly broke down on the highway.
(A) because that
(B) therefore
(C) because
(D) because of
5 The subway train was delayed for ten minutes ________ a major technical problem.
(A) because
(B) because of
(C) because from
(D) owing
6 I couldn’t find a parking spot right away ________ the parking lot was completely full.
(A) due to
(B) because of
(C) because
(D) because it
7 Please don’t be mad at me. I am late ________ the heavy rain flooding the main street.
(A) because
(B) though
(C) because for
(D) because of
8 I couldn’t run very fast to the cinema ________ I was carrying this heavy bag of snacks for us.
(A) because
(B) because of
(C) so that
(D) because with
9 I got lost for a few minutes ________ Google Maps gave me the wrong walking directions.
(A) due to
(B) because of
(C) because
(D) because to
10 I had to ask the taxi driver to take a detour ________ a huge accident on the bridge.
(A) nevertheless
(B) because
(C) reason of
(D) because of
11 I’m exhausted! I had to take the stairs ________ the escalator in the mall wasn’t working.
(A) because of
(B) in spite of
(C) because
(D) for because
12 My driver drove really slowly and carefully ________ the thick fog tonight.
(A) because of
(B) because
(C) instead of
(D) because by
13 I didn’t text you earlier to say I was running late ________ my phone battery died completely.
(A) due to
(B) because
(C) because having
(D) because of
14 It took me forever to cross the street ________ the massive crowd leaving the stadium.
(A) because
(B) nevertheless
(C) because of
(D) cause
15 I almost forgot my wallet, so I had to run back inside ________ I needed to pay you for the ticket.
(A) because of
(B) regardless of
(C) because for
(D) because
16 I am really frustrated ________ this terrible weather ruining our Friday night plans.
(A) because off
(B) because of
(C) however
(D) because
17 I couldn’t leave the office on time ________ my boss gave me an urgent task at the last minute.
(A) because
(B) because of
(C) as a result
(D) because that
18 The bus had to stop for a very long time ________ a broken traffic light at the intersection.
(A) since of
(B) despite
(C) because of
(D) because
19 I didn’t catch a taxi ________ there were none available in my neighborhood.
(A) consequently
(B) because
(C) because of
(D) because are
20 I promise I will buy the popcorn and drinks tonight ________ my terrible time management!
(A) because
(B) reason
(C) although
(D) because of
ANSWER KEY & EXPLANATIONS
1 (B)
- Why it is correct (The Key): “The terrible traffic” is a noun phrase. Therefore, we must use the preposition “because of” to indicate the reason.
- Error Analysis: (A) “Because” must be followed by a full clause (Subject + Verb) (Common Mistake). (C) Incorrect spelling/structure (Structural Error). (D) “Despite” , which contradicts the logic of giving a reason for being late (Meaning Trap).
2 (D)
- Why it is correct (The Key): “I left my apartment” is a full independent clause with a subject (“I”) and a verb (“left”). We must use the conjunction “because”.
- Error Analysis: (A) “Because of” cannot be followed by a full clause (Common Mistake). (B) “So” indicates a result, not a reason (Meaning Trap). (C) “Cause of” is a colloquial/broken structure for formal writing (Structural Error).
3 (A)
- Why it is correct (The Key): “The long line at the ticket counter” is a noun phrase acting as the “culprit”. We use “because of”.
- Error Analysis: (B) “Due of” is an invalid mix of “due to” and “because of” (Structural Error). (C) “Because” requires a subject and a verb (Common Mistake). (D) “Despite” creates an illogical sentence (Meaning Trap).
4 (C)
- Why it is correct (The Key): “My car suddenly broke down” is a full clause (Subject = my car, Verb = broke down). It requires “because”.
- Error Analysis: (A) “Because that” is a grammatical error (Structural Error). (B) “Therefore” shows a result, not a cause (Meaning Trap). (D) “Because of” cannot precede a full clause (Common Mistake).
5 (B)
- Why it is correct (The Key): “A major technical problem” is a noun phrase. We need “because of”.
- Error Analysis: (A) “Because” requires a clause (Common Mistake). (C) “Because from” is structurally invalid (Structural Error). (D) “Owing” must be followed by “to” to be correct (Meaning Trap).
6 (C)
- Why it is correct (The Key): “The parking lot was completely full” is a complete clause (Subject = the parking lot, Verb = was). We use “because”.
- Error Analysis: (A) “Due to” is a preposition and cannot be followed by a full clause (Meaning Trap). (B) “Because of” cannot precede a clause (Common Mistake). (D) “Because it” creates a double subject error (Structural Error).
7 (D)
- Why it is correct (The Key): “The heavy rain flooding the main street” is a complex noun phrase (Noun + participle modifying it). There is no main conjugated verb for this phrase, so we must use “because of”.
- Error Analysis: (A) “Because” requires a conjugated verb, but “flooding” is a participle here, not a main verb (Common Mistake). (B) “Though”, illogical context (Meaning Trap). (C) “Because for” is invalid (Structural Error).
8 (A)
- Why it is correct (The Key): “I was carrying…” is a full clause (Subject = I, Verb = was carrying). We use “because”.
- Error Analysis: (B) “Because of” cannot be followed by a clause (Common Mistake). (C) “So that” indicates purpose, not reason (Meaning Trap). (D) “Because with” is structurally wrong (Structural Error).
9 (C)
- Why it is correct (The Key): “Google Maps gave me the wrong directions” is a full clause. We use “because”.
- Error Analysis: (A) “Due to” requires a noun phrase (Meaning Trap). (B) “Because of” requires a noun phrase (Common Mistake). (D) “Because to” is invalid (Structural Error).
10 (D)
- Why it is correct (The Key): “A huge accident on the bridge” is a noun phrase. We use “because of”.
- Error Analysis: (A) “Nevertheless”, completely breaking the logic (Meaning Trap). (B) “Because” needs a full clause (Common Mistake). (C) “Reason of” is not a valid grammatical link here; it would need to be “by reason of” which is too formal/archaic (Structural Error).
11 (C)
- Why it is correct (The Key): “The escalator… wasn’t working” is a full clause. “Because” is the correct conjunction.
- Error Analysis: (A) “Because of” is used before nouns, not clauses (Common Mistake). (B) “In spite of” gives an opposite, illogical meaning (Meaning Trap). (D) “For because” is redundant and invalid (Structural Error).
12 (A)
- Why it is correct (The Key): “The thick fog tonight” is a noun phrase. We use “because of”.
- Error Analysis: (B) “Because” needs a subject and a verb (Common Mistake). (C) “Instead of”, making no sense here (Meaning Trap). (D) “Because by” is a broken structure (Structural Error).
13 (B)
- Why it is correct (The Key): “My phone battery died completely” is a full clause. We use “because”.
- Error Analysis: (A) “Due to” cannot precede a full clause (Meaning Trap). (C) “Because having” is grammatically invalid (Structural Error). (D) “Because of” is for noun phrases only (Common Mistake).
14 (C)
- Why it is correct (The Key): “The massive crowd leaving the stadium” is a complex noun phrase (Noun + participle). We need “because of”.
- Error Analysis: (A) “Because” is a Common Mistake here; learners see “leaving” and assume it’s a verb, but it’s a participle modifying “crowd”. There is no main verb. (B) “Nevertheless” is illogical (Meaning Trap). (D) “Cause” as a standalone preposition is slang and structurally incomplete (Structural Error).
15 (D)
- Why it is correct (The Key): “I needed to pay you” is a full clause. We use “because”.
- Error Analysis: (A) “Because of” is for noun phrases (Common Mistake). (B) “Regardless of”, changing the meaning to the opposite (Meaning Trap). (C) “Because for” is invalid (Structural Error).
16 (B)
- Why it is correct (The Key): “This terrible weather ruining our Friday night plans” is a noun phrase with a participle (“ruining”) attached to it. It requires “because of”.
- Error Analysis: (A) “Because off” is a spelling/structural error (Structural Error). (C) “However” is an adverb of contrast, not a reason (Meaning Trap). (D) “Because” requires a main conjugated verb, which is missing here (Common Mistake).
17 (A)
- Why it is correct (The Key): “My boss gave me an urgent task” is a full clause. We use “because”.
- Error Analysis: (B) “Because of” cannot take a full clause (Common Mistake). (C) “As a result” points to an effect, not a cause (Meaning Trap). (D) “Because that” is a structural error (Structural Error).
18 (C)
- Why it is correct (The Key): “A broken traffic light at the intersection” is a noun phrase. We use “because of”.
- Error Analysis: (A) “Since of” is an invalid combination of “since” and “because of” (Structural Error). (B) “Despite” breaks the logic of cause and effect (Meaning Trap). (D) “Because” needs a full clause (Common Mistake).
19 (B)
- Why it is correct (The Key): “There were none available…” is a full clause (Subject = there, Verb = were). We use “because”.
- Error Analysis: (A) “Consequently”, which is the wrong logical connector (Meaning Trap). (C) “Because of” cannot precede a “there is/there are” clause (Common Mistake). (D) “Because are” is missing the subject “there” (Structural Error).
20 (D)
- Why it is correct (The Key): “My terrible time management” is a noun phrase pointing directly to the “culprit”. We use “because of”.
- Error Analysis: (A) “Because” needs a subject and verb (Common Mistake). (B) “Reason” needs to be phrased as “for the reason of” to be correct (Structural Error). (C) “Although” , which destroys the logical apology (Meaning Trap).
GRAMMAR POINTS TO REMEMBER
- BECAUSE + Clause (Subject + Verb):
- Use “because” when you want to tell a complete mini-story about why something happened. It MUST be followed by a Subject and a conjugated Verb.
- Example: I am late because [my car] [broke] down. (S + V)
- BECAUSE OF + Noun / Noun Phrase / V-ing:
- Use “because of” when you want to point your finger directly at the “culprit” or the object that caused the situation. It CANNOT be followed by a conjugated verb.
- Example: I am late because of [the terrible traffic]. (Noun Phrase)
- The “Participle” Trap (V-ing):
- Be very careful with sentences like: “I am late ________ the rain flooding the street.” * Many learners see the word “flooding” and think it is a Verb, so they use “Because”. This is a mistake! “Flooding” here is just an adjective (participle) describing the rain. The whole thing is just one big Noun Phrase. Therefore, you must use “Because of”.