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Modal verbs
- 1. ABILITY Can Could Be able to Present Past Future REQUEST AND PERMISION May Could Can Formal Informal OBLIGATION Must Strong obligation Have to / Need to Don’t have to / Don’t need to / Needn’t Lack of obligation PROHIBITION Mustn’t ADVICE Should Ought to Had better Should have + V3 POSSIBILITY Must 90% Can / May Could / Might 50% Can’t 0% Past Had better always contains the suggestion of negative consequences
- 2. General Most modal verbs… • have the same form for all persons: I can, you can, he can… •do not use do / does to form the negative or interrogative: Must you came so late? I shouldn’t be so lazy, etc. •are followed by the infitive without to: We must go, they should see, etc.