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Idiomatic
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Modal Verbs
1.  I ......... go to see the doctor last week because I was very ill.
 must  must to  had to


2.  I could ......... bought that car but I didn't have enough money to pay for the petrol.
 had  have  have to


3.  I ......... go now because I am already late for my class.
 must  had  have to


4.  I may ......... able to come to your party if I have the time.
 be  being  being to


5.  Do you ......... clean the house every day or every week?
 must  have  have to


6.  I ......... speak French without a problem now because I have had many lessons.
 may  can  have


7.  They ......... do their homework today because it is a holiday at the school.
 must not  don't have  don't have to


8.  I ......... help you with your shopping because you have a lot of bags.
 ought  ought to  thought


9.  When will you ......... come and see us in our new house?
 can  be able to  must


10.  I may ......... go to Paris next week because there is a very big exhibition there.
 have  have to  had