Modal Verbs

Question	Answer
MODAL VERBS > They always come before the main verb. > They do not take an -s, -ing or -ed suffix. > They are followed by a bare infinitive (with the exception of ought [+to +verb])	MODAL VERBS > They are classified as semi-verbs. > They have positive and negative forms (can-can't, should-shouldn't, must-mustn't,...). > They act as auxiliaries in questions: modal + subject + verb
Advice	Should - Shouldn't (Ought to) You should see a doctor
Obligation	Must (only in the present tense) Have to (to form all the other tenses) You must study hard He had to leave earlier yesterday
Ability	Can-Can't / Could-Couldn't I can design dresses He could climb the mountain
Possibility and permission	May-May not / Might-Might not / Could-couldn't That is the sort of thing Tom may like. May I use your phone?
Prohibition	Mustn't You mustn't talk during the exam
Logical assumption	Must (affirmative sentences) / Can't (negative sentences) She must be at work. She can't be at work

Resource summary

	Created by Lucía Yoga about 2 years ago