Fill in the blanks with an appropriate auxiliary verb.
1Anybody who wants to participate ............... register.
Select 2 answers.
Wrong!
Both fit: "can" gives permission or possibility to register, and "must" makes registering a requirement.
2I ............... have bought that car if I had had more money.
Wrong!
The correct answer is "could" because "could have bought" describes past ability in an unreal situation.
3I'm not sure, but she ............... arrive in the afternoon.
Select 2 answers.
Wrong!
The correct answers are "may" and "might" because both express possibility, which fits "I'm not sure".
4"We went hiking yesterday." "That ............... have been a lot of fun."
Wrong!
The correct answer is "must" because "must have been" expresses a logical conclusion about the past.
5One day, it ............... be possible to connect with extraterrestrial life.
Wrong!
The correct answer is "will" because it expresses a future prediction.
6I ............... pay you back when I get a job.
Wrong!
The correct answer is "will" because it expresses a promise about the future.
7Glass ............... be blown.
Wrong!
The correct answer is "can" because it expresses theoretical possibility.
8You ............... have called me if you weren't coming.
Wrong!
The correct answer is "should" because "should have called" criticizes a past action.
9You ............... not violate the law.
Wrong!
The correct answer is "must" because "must not" expresses prohibition.
10The saplings ............... be watered regularly.
Wrong!
The correct answer is "must" because it expresses necessity in this passive sentence.
11By next December, I ............... have been teaching here for twenty years.
Wrong!
The correct answer is "will" because it forms the future perfect continuous in this sentence.
12............... I open the window for you?
Select 2 answers.
Wrong!
Both "Shall" and "Should" can be used with "I" to make an offer or ask what someone wants; "Will I...?" is not used for offers in standard English.
Exercise complete
0 out of 12
correct answers
Answers
- Anybody who wants to participate can / must register.
- I could have bought that car if I had had more money.
- I’m not sure, but she may / might arrive in the afternoon.
- “We went hiking yesterday.” “That must have been a lot of fun.”
- One day, it will be possible to connect with extraterrestrial life.
- I will pay you back when I get a job.
- Glass can be blown.
- You should have called me if you weren’t coming.
- You must not violate the law.
- The saplings must be watered regularly.
- By next December, I will have been teaching here for twenty years.
- Shall / Should I open the window for you?