Can vs. Could – English Grammar Exercises for A2
You are talking to the IT department. You are explaining the technical problems you had with your computer yesterday. Read the sentences carefully and choose the best option (A, B, C, or D) to complete your report.
1 “Hello IT support. I am calling because yesterday morning, I ______ open the monthly report file.”
(A) can’t
(B) couldn’t
(C) didn’t can
(D) don’t can
2 “I typed my password three times, but I ______ log into my email account last night.”
(A) can’t
(B) couldn’t
(C) wasn’t can
(D) didn’t could
3 “IT Support: ______ you see any error messages on the screen when that happened?”
(A) Did you can
(B) Can
(C) Could
(D) Do you could
4 “No, the screen was completely black. I ______ see anything at all.”
(A) can’t
(B) couldn’t
(C) wasn’t could
(D) don’t can
5 “I tried to restart the computer, but the power button ______ work. It was completely frozen.”
(A) couldn’t
(B) can’t
(C) didn’t can
(D) couldn’t to
6 “Because the internet was down all afternoon, my computer ______ connect to the company server.”
(A) couldn’t
(B) can’t
(C) not could
(D) don’t could
7 “I had an important online meeting at 2:00 PM, but I ______ join the Zoom call.”
(A) can’t
(B) didn’t can
(C) couldn’t
(D) am not can
8 “During the meeting, my microphone was broken, so I ______ speak to the clients.”
(A) couldn’t to
(B) couldn’t
(C) can’t
(D) didn’t could
9 “IT Support: I see. ______ you use your mobile phone to join the meeting instead?”
(A) Did you can
(B) Are you could
(C) Can
(D) Could
10 “I tried, but the office Wi-Fi was off, so my phone ______ load the video either.”
(A) can’t
(B) couldn’t
(C) didn’t can
(D) wasn’t could
11 “I needed to print the contract, but the printer ______ find a connection to my laptop yesterday.”
(A) couldn’t
(B) can’t
(C) doesn’t can
(D) not can
12 “When I clicked on the website link, the browser ______ open the page. It just loaded forever.”
(A) can’t
(B) couldn’t to
(C) couldn’t
(D) wasn’t can
13 “My colleague tried to send me the files on a USB drive, but my computer ______ read the USB.”
(A) couldn’t
(B) can’t
(C) don’t can
(D) couldn’t to
14 “IT Support: Did you try to update the software yesterday? Sometimes old software ______ open new files.”
(A) couldn’t
(B) can’t
(C) didn’t can
(D) wasn’t can
15 “I wanted to update it, but I ______ do it because the system asked for an administrator password.”
(A) can’t
(B) couldn’t
(C) didn’t could
(D) wasn’t could
16 “Before the system crashed, I was typing an email, but I ______ save my progress in time.”
(A) couldn’t
(B) can’t
(C) didn’t can
(D) couldn’t to
17 “My keyboard started acting crazy. I ______ type any numbers, only letters.”
(A) can’t
(B) couldn’t
(C) don’t can
(D) didn’t could
18 “Because of all these issues, I ______ finish my daily tasks before 5:00 PM.”
(A) can’t
(B) couldn’t
(C) wasn’t could
(D) didn’t can
19 “IT Support: I understand. We fixed the server last night. ______ you open the file this morning?”
(A) Did you can
(B) Could
(C) Can
(D) Do you can
20 “Yes, everything is working fine now. I just wanted to report why I ______ finish the work yesterday.”
(A) can’t
(B) couldn’t
(C) don’t can
(D) didn’t could
ANSWER KEY & EXPLANATIONS
1 Key: (B) couldn’t
Explanation: – Why it’s correct: “Yesterday morning” tells us this is a past event. “Couldn’t” describes the past inability to open the file.
- Why others are wrong: (A) “Can’t” is for the present. (C) “Didn’t can” and (D) “Don’t can” are major grammatical errors (we never use do/did with can/could).
2 Key: (B) couldn’t
Explanation: – Why it’s correct: “Last night” places the action in the past.
- Why others are wrong: (A) is present. (C) “Wasn’t can” and (D) “Didn’t could” are completely invalid structures.
3 Key: (C) Could
Explanation: – Why it’s correct: The IT worker is asking a question about a past ability (“when that happened”). We put “Could” at the front of the question.
- Why others are wrong: (A) “Did you can” is invalid. (B) “Can” is present tense. (D) “Do you could” is invalid.
4 Key: (B) couldn’t
Explanation: – Why it’s correct: “The screen was completely black” (past tense). Therefore, the inability to see happened in the past.
- Why others are wrong: (A) is present. (C) and (D) are invalid grammar.
5 Key: (A) couldn’t
Explanation: – Why it’s correct: Describing a machine’s failure to operate in the past (“was frozen”).
- Why others are wrong: (B) is present. (C) is invalid. (D) “Couldn’t to” has an illegal “to” after the modal.
6 Key: (A) couldn’t
Explanation: – Why it’s correct: “The internet was down all afternoon” refers to a past situation.
- Why others are wrong: (B) is present. (C) The correct negative is couldn’t, not “not could”. (D) “Don’t could” is invalid.
7 Key: (C) couldn’t
Explanation: – Why it’s correct: “I had an important meeting” (past).
- Why others are wrong: (A) is present. (B) and (D) are invalid auxiliary combinations.
8 Key: (B) couldn’t
Explanation: – Why it’s correct: “My microphone was broken” (past).
- Why others are wrong: (A) adds “to”. (C) is present. (D) uses “didn’t”.
9 Key: (D) Could
Explanation: – Why it’s correct: Asking a question about an alternative option the user had in the past.
- Why others are wrong: (A) and (B) are invalid structures. (C) is present tense.
10 Key: (B) couldn’t
Explanation: – Why it’s correct: “The office Wi-Fi was off” (past). The phone lacked the ability to connect yesterday.
- Why others are wrong: (A) is present. (C) and (D) are invalid.
11 Key: (A) couldn’t
Explanation: – Why it’s correct: “Yesterday” indicates a past equipment failure.
- Why others are wrong: (B) is present. (C) “Doesn’t can” is invalid. (D) is the wrong word order.
12 Key: (C) couldn’t
Explanation: – Why it’s correct: “When I clicked” (past). The browser failed to do its job.
- Why others are wrong: (A) is present. (B) has “to”. (D) uses “wasn’t”.
13 Key: (A) couldn’t
Explanation: – Why it’s correct: “My colleague tried” (past). The computer was unable to read the drive.
- Why others are wrong: (B) is present. (C) and (D) are invalid.
14 Key: (B) can’t
Explanation: – Why it’s correct: “Sometimes old software can’t open new files.” This is a general truth or fact about software that applies to the present and in general, not just yesterday.
- Why others are wrong: (A) is for the past, but the IT worker is stating a general rule here. (C) and (D) are invalid.
15 Key: (B) couldn’t
Explanation: – Why it’s correct: “I wanted to update it… system asked” (past). The speaker lacked the ability yesterday because of the password.
- Why others are wrong: (A) is present. (C) and (D) are invalid.
16 Key: (A) couldn’t
Explanation: – Why it’s correct: “Before the system crashed, I was typing…” (past).
- Why others are wrong: (B) is present. (C) and (D) are invalid.
17 Key: (B) couldn’t
Explanation: – Why it’s correct: “My keyboard started acting crazy” (past).
- Why others are wrong: (A) is present. (C) and (D) are invalid.
18 Key: (B) couldn’t
Explanation: – Why it’s correct: Concluding the story about yesterday’s failure to finish tasks.
- Why others are wrong: (A) is present. (C) and (D) are invalid.
19 Key: (C) Can
Explanation: – Why it’s correct: The IT support is asking about the user’s ability right now (“this morning”). We use “Can” for present ability.
- Why others are wrong: (A) and (D) are invalid. (B) “Could” asks about the past, but the time marker is “this morning” (the present state).
20 Key: (B) couldn’t
Explanation: – Why it’s correct: The user is referring back to the main point: explaining why they were unable to finish the work yesterday.
- Why others are wrong: (A) is present. (C) and (D) are invalid.
GRAMMAR POINTS TO REMEMBER
- Past Inability (Couldn’t) for Tech Issues:
- In English, we treat computers and machines as if they have “abilities”. If a machine breaks or fails to do its job in the past, we use couldn’t.
- Example: “The printer couldn’t connect to the Wi-Fi yesterday.” (It lacked the ability to do so).
- Present Inability (Can’t):
- If the computer is broken right now, or if you are stating a general fact about technology, you use can’t.
- Example: “My laptop can’t turn on today.”
- Look for the “Time Markers”:
- Pay close attention to the time words in the sentence. Words like yesterday, last night, this afternoon, was, tried, clicked mean the action is in the past, so you MUST use couldn’t.
- Words like now, today, this morning (when referring to the current moment) mean you should use can or can’t.
- The “Never Do This” Rules:
- No DO/DID: Never use didn’t, don’t, doesn’t, was, or wasn’t next to can or could. Modals make their own negatives! (Say: I couldn’t load the file, NEVER I didn’t could load the file).
- No TO: Never put to after a modal verb. (Say: I couldn’t print, NEVER I couldn’t to print).