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Use must be or must have been if you are sure in a positive sense but can't be, can't have been, or couldn't have been if you are sure in a negative sense. Use can't to express an opinion that you are 100 percent sure is not true. She could have stayed at home today, or she might have gone to work. Past = could have + past participle (done)Įxamples of the modal verb could in the past tense include:.The construction of could in the present tense is: We could hire that company or the other.Jane could be at work, or she could be at home.The construction in the present would be:Įxamples of using could in the present tense in dialogue include: It is just one of a number of possibilities. This form is not as strong as might or may.
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Use could to express a possibility which is one of many.
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I think he wanted to practice French this summer.
#Perfect modal verbs exercises with answers plus#
Use must plus the verb when you are almost 100 percent sure that something is the case. For ease of grading, the answers follow the brief test. When finished reviewing the various modal verbs, take the quiz-or have students take the quiz-after the examples. But the speaker does not know for sure, which makes the verb must a modal verb of probability. For example, "He must be at work it's 10 o'clock." In this sentence, the speaker is nearly sure that the person is at work based on the speaker's knowledge that the person in question usually works during the day. Put another way, you use modal verbs when you want to guess something, notes Perfect English. Modal verbs of probability are used to express an opinion of the speaker based on information that the speaker has.