Saylor URL: http://www.saylor.org/books Saylor.orgModal Auxiliary Use Modal Auxiliary + Main Verb
I would go with you if I didn’t have to
babysit tonight. (explain an action)He would write to me every week when
we were dating. (habitual past action)must Expresses obligation We must be on time for class.ought to Expresses obligationI ought to mail my RSVP. (obligation,
same as may)Tip
Use the following format to form a yes-no question with a modal auxiliary:Modal
auxiliary +^ subject^ +^ main verb^
Should I drive?Be aware of these four common errors when using modal auxiliaries:- Using an infinitive instead of a base verb after a modal
Incorrect: I can to move this heavy table.Correct: I can move this heavy table.- Using a gerund instead of an infinitive or a base verb after a modal
Incorrect: I could moving to the United States.Correct: I could move to the United States.- Using two modals in a row
Incorrect: I should must renew my passport.Correct: I must renew my passport.Correct: I should renew my passport.