Can vs. Could – English Grammar Exercises for A2
You are the class president. You are texting the class group chat to announce that the bus for the upcoming field trip is completely full. You need to explain the physical limits of the bus and the rules. Read the messages carefully and choose the best option (A, B, C, or D) to complete each sentence.
1 “Attention everyone! We have 45 seats on the bus and exactly 45 students signed up. We ______ take anyone else.”
(A) can’t
(B) couldn’t
(C) don’t can
(D) wasn’t can
2 “Last year, we rented a much bigger bus, so we ______ fit 60 people easily.”
(A) can
(B) could
(C) can to
(D) do can
3 “Classmate: ______ I squeeze into the back seat with my friends?”
(A) Do I can
(B) Can
(C) Am I can
(D) Could to
4 “You: Sorry, you ______. The driver says every student must have their own seat belt.”
(A) couldn’t
(B) can’t
(C) don’t can
(D) wasn’t could
5 “It is against the law. The bus company strictly said they ______ allow people to stand in the aisle.”
(A) can’t
(B) couldn’t
(C) not can
(D) didn’t could
6 “Yesterday, I tried to book a second bus for the extra students, but I ______ find any available.”
(A) can’t
(B) couldn’t
(C) didn’t can
(D) wasn’t can
7 “If someone cancels tomorrow, I ______ give their seat to the first person on the waiting list.”
(A) could to
(B) cans
(C) can
(D) do can
8 “But right now, the capacity is at 100%. I ______ promise you a spot today.”
(A) can’t
(B) couldn’t
(C) don’t can
(D) didn’t could
9 “When we organized the trip in 2022, we ______ invite other classes because of the strict COVID-19 rules.”
(A) can’t
(B) couldn’t
(C) didn’t can
(D) wasn’t could
10 “Please note that the luggage compartment is also full. You ______ bring a large suitcase.”
(A) can’t
(B) couldn’t
(C) don’t can
(D) didn’t could
11 “To save space, you ______ only bring a small backpack that fits under your seat.”
(A) can
(B) could
(C) can to
(D) cans
12 “Classmate: ______ you ask the school for a bit more money last week to get a bigger bus?”
(A) Can
(B) Could
(C) Do you can
(D) Did you can
13 “You: I asked the principal, but the school ______ give us a larger budget this time.”
(A) can’t
(B) couldn’t
(C) didn’t can
(D) wasn’t could
14 “We have already signed the contract and paid for this exact bus, so we ______ change it now.”
(A) couldn’t
(B) can’t
(C) don’t can
(D) didn’t can
15 “If you are not on the final list, don’t worry! You ______ definitely join us on the next trip in the spring!”
(A) cans
(B) could to
(C) can
(D) do can
16 “I am sorry I ______ reply to your private messages last night; I was too busy finalizing the numbers.”
(A) can’t
(B) couldn’t
(C) didn’t can
(D) wasn’t can
17 “Please do not send me any more money transfers! The system is closed, and I ______ accept them.”
(A) can’t
(B) couldn’t
(C) don’t can
(D) didn’t could
18 “Classmate: ______ we drive our own cars and meet the bus at the campsite instead?”
(A) Can
(B) Do we can
(C) Are we can
(D) Could we to
19 “You: Yes, you ______ do that! Just let me know by tonight so I can update the teacher.”
(A) can
(B) could to
(C) cans
(D) do can
20 “But regarding the bus itself, it is completely packed. We ______ fit even one more mouse in there!”
(A) couldn’t
(B) can’t
(C) don’t can
(D) didn’t can
ANSWER KEY & EXPLANATIONS
1 Key: (A) can’t
Explanation: – Why it’s correct: You are describing a present, physical impossibility. The bus is full right now, so you lack the ability to take more people.
- Why others are wrong: (B) “Couldn’t” is for the past. (C) “Don’t can” and (D) “Wasn’t can” are invalid grammar.
2 Key: (B) could
Explanation: – Why it’s correct: “Last year” places the ability in the past.
- Why others are wrong: (A) is present. (C) has “to”. (D) uses “do”.
3 Key: (B) Can
Explanation: – Why it’s correct: A classmate is asking for present permission/possibility.
- Why others are wrong: (A), (C), and (D) are all structurally invalid.
4 Key: (B) can’t
Explanation: – Why it’s correct: You are denying the request in the present due to safety rules.
- Why others are wrong: (A) is past. (C) and (D) are invalid.
5 Key: (A) can’t
Explanation: – Why it’s correct: This is a present rule/impossibility dictated by the bus company.
- Why others are wrong: (B) is past. (C) and (D) are invalid.
6 Key: (B) couldn’t
Explanation: – Why it’s correct: “Yesterday” points to a past inability (failing to book a second bus).
- Why others are wrong: (A) is present. (C) and (D) are invalid.
7 Key: (C) can
Explanation: – Why it’s correct: “Tomorrow” sets up a future/present possibility.
- Why others are wrong: (A) has “to”. (B) has “-s”. (D) uses “do”.
8 Key: (A) can’t
Explanation: – Why it’s correct: “Right now” confirms this is a present inability.
- Why others are wrong: (B) is past. (C) and (D) are invalid.
9 Key: (B) couldn’t
Explanation: – Why it’s correct: “In 2022” is a specific past time. They lacked the ability back then.
- Why others are wrong: (A) is present. (C) and (D) are invalid.
10 Key: (A) can’t
Explanation: – Why it’s correct: A present physical limit—the luggage space is full now.
- Why others are wrong: (B) is past. (C) and (D) are invalid.
11 Key: (A) can
Explanation: – Why it’s correct: Stating what is presently allowed.
- Why others are wrong: (B) is past. (C) has “to”. (D) has “-s”.
12 Key: (B) Could
Explanation: – Why it’s correct: Asking about a past action/ability (“last week”).
- Why others are wrong: (A) is present. (C) and (D) incorrectly use “Do/Did” to form modal questions.
13 Key: (B) couldn’t
Explanation: – Why it’s correct: Answering the previous question about the school’s past refusal/inability to give more money.
- Why others are wrong: (A) is present. (C) and (D) are invalid.
14 Key: (B) can’t
Explanation: – Why it’s correct: “Now” indicates a present impossibility because the contract is already signed.
- Why others are wrong: (A) is past. (C) and (D) are invalid.
15 Key: (C) can
Explanation: – Why it’s correct: Confirming a present/future possibility.
- Why others are wrong: (A) has “-s”. (B) has “to”. (D) uses “do”.
16 Key: (B) couldn’t
Explanation: – Why it’s correct: “Last night” places the inability to reply in the past.
- Why others are wrong: (A) is present. (C) and (D) are invalid.
17 Key: (A) can’t
Explanation: – Why it’s correct: The system is closed now, creating a present impossibility to accept money.
- Why others are wrong: (B) is past. (C) and (D) are invalid.
18 Key: (A) Can
Explanation: – Why it’s correct: Asking about a present/future option.
- Why others are wrong: (B), (C), and (D) are structurally invalid questions.
19 Key: (A) can
Explanation: – Why it’s correct: Confirming that the suggested option is possible.
- Why others are wrong: (B) has “to”. (C) has “-s”. (D) uses “do”.
20 Key: (B) can’t
Explanation: – Why it’s correct: Summarizing the present physical limit—the bus is completely full right now.
- Why others are wrong: (A) is past. (C) and (D) are invalid.
GRAMMAR POINTS TO REMEMBER
- Present Impossibility (Can’t):
- We use can’t (cannot) to state that something is 100% impossible right now due to physical limits, rules, or facts.
- Example: “The bus has 45 seats and 45 people. We can’t take anyone else.” (It is physically impossible to fit another person safely).
- Past Inability (Couldn’t):
- If you are talking about an impossibility or a lack of ability in the past, you must use couldn’t.
- Example: “I couldn’t find a second bus yesterday.”
- Look for the Timeline Cues:
- Present (Can/Can’t): Look for words like now, right now, today, tomorrow, currently.
- Past (Could/Couldn’t): Look for words like last year, yesterday, last night, in 2022, when we planned it.
- The “Never Do This” List:
- Never use do, does, did, was, or were with a modal. (Say: I can’t, NEVER I don’t can).
- Never add to after a modal. (Say: We can go, NEVER We can to go).
- Never add -s to a modal. (Say: He can fit, NEVER He cans fit).