Can vs. Could – English Grammar Exercises for A2
You are texting your best friend. You are very sad because you missed an amazing concert last night because your boss made you work overtime. Read the conversation carefully and choose the best option (A, B, C, or D) to complete your messages.
1 “I am so sad about last night. I ______ go to the concert with you because my boss made me work late.”
(A) couldn’t
(B) can’t
(C) didn’t can
(D) wasn’t could
2 “I tried to finish my work quickly, but I ______ complete the report before 9 PM.”
(A) can’t
(B) couldn’t
(C) don’t can
(D) wasn’t can
3 “Friend: It’s a pity you weren’t there! We ______ see the stage perfectly from our seats.”
(A) can
(B) could
(C) could to
(D) are could
4 “I wanted to call you to say sorry, but my phone battery died and I ______ find a charger in the office.”
(A) couldn’t
(B) can’t
(C) didn’t could
(D) couldn’t to
5 “Friend: It’s okay. The music was so loud that we ______ hear our phones ring anyway!”
(A) couldn’t
(B) can’t
(C) wasn’t could
(D) couldn’t to
6 “I was so tired when I finally left the office. I ______ even keep my eyes open on the way home.”
(A) couldn’t
(B) can’t
(C) didn’t can
(D) don’t can
7 “Friend: ______ you hear the music from your office? The stadium is quite close to your building.”
(A) Do you could
(B) Could
(C) Can
(D) Did you can
8 “No, my office building is completely soundproof, so I ______ hear anything at all from the outside.”
(A) couldn’t
(B) can’t
(C) not could
(D) didn’t could
9 “I tried to buy a ticket for tonight’s show instead, but I ______. They were completely sold out.”
(A) couldn’t
(B) can’t
(C) didn’t can
(D) couldn’t to
10 “Friend: That’s too bad. I bought my ticket months ago, so I ______ get a VIP pass easily back then.”
(A) can
(B) could
(C) could to
(D) am could
11 “When I saw your videos on Instagram last night, I felt so jealous. I ______ believe I missed my favorite song!”
(A) couldn’t
(B) can’t
(C) don’t can
(D) didn’t can
12 “Friend: It was crazy! The lead singer jumped into the crowd, and we ______ actually touch his hand.”
(A) can
(B) could
(C) cans
(D) are can
13 “I ran to the train station after work, but I was too late. I ______ catch the last train to the stadium.”
(A) can’t
(B) couldn’t
(C) wasn’t could
(D) didn’t can
14 “Because I missed the train, I ______ get there in time for the ending of the show.”
(A) couldn’t
(B) can’t
(C) didn’t could
(D) don’t could
15 “Friend: Did you ask your boss if you ______ leave early?”
(A) can
(B) could
(C) could to
(D) did can
16 “I asked him, but he said no. I ______ leave because the client project was due today.”
(A) couldn’t
(B) can’t
(C) wasn’t can
(D) didn’t can
17 “I was so angry and disappointed that I ______ sleep when I got home last night.”
(A) couldn’t
(B) can’t
(C) don’t could
(D) not could
18 “Friend: Don’t be sad. They are coming back next year, so we ______ go together then!”
(A) could
(B) can
(C) can to
(D) did can
19 “You are right. But yesterday, I was so upset that I ______ stop crying in my room.”
(A) couldn’t
(B) can’t
(C) didn’t can
(D) wasn’t could
20 “I know I ______ change the past now, but I will definitely make sure I get the day off next time.”
(A) couldn’t
(B) can’t
(C) don’t can
(D) didn’t could
ANSWER KEY & EXPLANATIONS
1 Key: (A) couldn’t
Explanation: – Why it’s correct: “Last night” indicates a past event. The speaker wanted to go, but lacked the ability/opportunity because of work. “Couldn’t” is the past negative form of “can”.
- Why others are wrong: (B) “Can’t” is for present ability. (C) and (D) “Didn’t can” and “Wasn’t could” are grammatically invalid. Modals never use “did” or “was”.
2 Key: (B) couldn’t
Explanation: – Why it’s correct: “I tried” (past tense) shows the action happened in the past. We must use “couldn’t” for a past inability.
- Why others are wrong: (A) “Can’t” is present. (C) and (D) are invalid structures.
3 Key: (B) could
Explanation: – Why it’s correct: The friend is talking about their past ability to see the stage at the concert last night.
- Why others are wrong: (A) is present tense. (C) adds an illegal “to” after the modal. (D) combines “are” and “could”, which is incorrect.
4 Key: (A) couldn’t
Explanation: – Why it’s correct: “My phone battery died” (past). The inability to find a charger happened in the past.
- Why others are wrong: (C) “Didn’t could” is a common beginner mistake; we do not use “did” to make modals negative. (D) has an illegal “to”.
5 Key: (A) couldn’t
Explanation: – Why it’s correct: “The music was so loud” (past). The inability to hear happened at the concert last night.
- Why others are wrong: (B) is present. (C) and (D) are invalid.
6 Key: (A) couldn’t
Explanation: – Why it’s correct: “I was so tired” (past). “Couldn’t” describes the past physical limit of not being able to keep the eyes open.
- Why others are wrong: (B) is present. (C) and (D) use invalid auxiliaries (“didn’t/don’t”).
7 Key: (B) Could
Explanation: – Why it’s correct: To ask a question about past ability, we simply put “Could” at the beginning of the sentence: “Could you hear…?”
- Why others are wrong: (A) “Do you could” and (D) “Did you can” are completely invalid. Never use do/does/did to make questions with can/could. (C) is present tense.
8 Key: (A) couldn’t
Explanation: – Why it’s correct: Answering the previous question about the past situation.
- Why others are wrong: (C) “Not could” is the wrong word order (it must be could not / couldn’t).
9 Key: (A) couldn’t
Explanation: – Why it’s correct: “I tried” and “They were completely sold out” are in the past. The failure to buy the ticket happened in the past.
- Why others are wrong: (B) is present tense.
10 Key: (B) could
Explanation: – Why it’s correct: “I bought my ticket months ago” sets the context in the past. She had the ability to get a VIP pass back then.
- Why others are wrong: (A) is present. (C) adds “to”. (D) adds “am”.
11 Key: (A) couldn’t
Explanation: – Why it’s correct: “When I saw your videos… last night” sets the past context. The feeling of disbelief happened in the past.
- Why others are wrong: (B) is present. (C) and (D) are invalid.
12 Key: (B) could
Explanation: – Why it’s correct: “The lead singer jumped” (past). The fans had the past opportunity to touch him.
- Why others are wrong: (A) is present. (C) adds an “-s” to a modal, which is always wrong.
13 Key: (B) couldn’t
Explanation: – Why it’s correct: “I ran” and “I was too late” are past tense. The failure to catch the train is a past inability.
- Why others are wrong: (A) is present.
14 Key: (A) couldn’t
Explanation: – Why it’s correct: “I missed the train” (past).
- Why others are wrong: (C) “Didn’t could” and (D) “Don’t could” are grammatically invalid.
15 Key: (B) could
Explanation: – Why it’s correct: The friend is asking about the past conversation with the boss (“Did you ask…”). “Could” is used for past permission/ability.
- Why others are wrong: (A) is present. (D) “Did can” is invalid.
16 Key: (A) couldn’t
Explanation: – Why it’s correct: “He said no” (past). The speaker was denied the ability to leave.
- Why others are wrong: (B) is present. (C) is invalid.
17 Key: (A) couldn’t
Explanation: – Why it’s correct: “I was so angry” (past). The inability to sleep happened last night.
- Why others are wrong: (B) is present.
18 Key: (B) can
Explanation: – Why it’s correct: “Next year” points to a future/present opportunity. We use “can” to express this.
- Why others are wrong: (A) “Could” is for the past (or for very polite requests/hypotheticals, but “can” is the most direct and correct choice here). (C) has an illegal “to”.
19 Key: (A) couldn’t
Explanation: – Why it’s correct: “Yesterday, I was so upset” places the action firmly in the past.
- Why others are wrong: (B) is present. (C) and (D) are invalid.
20 Key: (B) can’t
Explanation: – Why it’s correct: Notice the word “now”. The speaker is talking about their inability to change history in the present moment.
- Why others are wrong: (A) “Couldn’t” is for the past, but the speaker is expressing a present truth (“I know I can’t change the past now”).
GRAMMAR POINTS TO REMEMBER
- Past Inability (Couldn’t):
- We use couldn’t (could not) to talk about an opportunity, skill, or ability that we did not have in the past.
- When you regret a missed event (like a concert yesterday), you use “couldn’t” to show that circumstances stopped you from going.
- Example: “I wanted to go, but I couldn’t.” (I didn’t have the ability/time).
- Present Inability (Can’t):
- We use can’t (cannot) to talk about an inability in the present moment.
- Example: “I can’t change the past now.”
- Look for the “Signal Words”:
- On a grammar test, always look for time words. Words like yesterday, last night, last week, when I was younger, or past verbs (was, tried, wanted, asked) mean you MUST use could or couldn’t.
- The “Never Do This” Rules for Modals:
- Never use DO/DOES/DID: Modals do not need help. (Say: I couldn’t go, NEVER say: I didn’t could go).
- Never use TO: Modals are followed directly by the base verb. (Say: I could see, NEVER say: I could to see).