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Affi rmative StatementShe can work.He would be working.They should have worked.I could have been working.Affirmative Statement with Tag Qu estionShe can work, can·t she?He would be worki ng, wouldn·t he?They should have worked, shouldn"t they?I could have been working, couldn"t I?2. Relationships among the modal auxiliariesJust as would can be used as the past of will; could can be used as the past of can;might can be used as the past of may; and should can be used as the past of shall. Theauxiliary must can refer either to the present or to the past. These relationships amongthe modal auxiliaries can be summarized as follows:PresentcanmaymustshallwillPastcouldmightmustshouldwouldThe following examples illustrate these relationships:Tense of Verb in Main ClauseSimple PresentSimple PastSimple PresentSimple PastSimple PresentSimple PastSimple PresentSimple PastComplete SentenceI think I can do it.I thought I could do it.He predicts it may rain.He predicted it might rain.She knows she must be there.She knew she must be there.I wonder what we shall do tomorrow.I wondered what we should do the next day.See Exercises 4 and 5.Each of the modal auxiliaries has more than one meaning. The meaning depends uponthe context in which the auxiliary is used.3. Can and CouldThe modal auxiliary can is most often used in the Simple conjugation.