Unit 8 Do’s and Don’ts Grammar

Table of contents Have to Modal auxiliary verbs Should Must

Have to Form: + : S + have/has + to + infinitive - : S + have/has + NOT + to + infinitive ? : Do/Does + S + have + to + infinitive ? Note: past tense of “have” is “had”, with did and didn’t in the question and negative.

Have to Use: “Have to” expresses strong obligation (coming from “outside”) e.g.: You have to go to school. “Don’t/Doesn’t” have to expresses absence of obligation, e.g.: We don’t have to wash the dishes tonight. “Have to” expresses obligation as a habit, while have got to expresses it on a particular occasion.

Modal auxiliary verbs These are modal auxiliary verbs: Can - Could Must - Shall Should - Will Would - May Can you think of an example for each one?

Modal auxiliary verbs Notes: They go with another verb and add meaning There is no “s” in the third person singular There is no do/does in the question There is no don’t/doesn’t in the negative

Should Form: Should + infinitive Use: the forms of should are the same for all persons. Use: Should expresses what the speaker think is right or most appropriate. However, it can express just the opinion of them. Shouldn’t” expresses negative advice.

Must Form: Must + infinitive the forms of must are the same for all persons. In questions, we should use “have to” instead of “must”

Must Use: Must expresses strong obligation ( coming from the “inside” of the speaker). Be careful when using must, you may sound “bossy” However, must can also express a strong suggestion.

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