English Exercises > modals exercises

must/can´t/might and the present/perfect infinitive

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Use  can't   or    must  or   might/might not    and  present or perfect infinitive (simple or continuous) as in the example :

I am sure she works as a nurse      -         She must work as a nurse.  

Tip: present infinitive : to work   perfect infinitive : to have worked  
  continuous form : to be working continuous form : to have been working 

1.I am sure the students are taking a test at  the moment.
   The students   a test at the moment.
2.I am sure they played in several films together.
   They in several films together.
3.I am not sure, but perhaps he will be the new star in the film.
   He  the new star in the film.
4.I am not sure, but I think he didn't come here to apologize.
   He  here to apologize.
5.It is certain that  the Smiths didn't  like their new house.
   The Smiths  their new house.
6.Perhaps she was taking poetry lessons.
   She   poetry lessons.
7.The couple is having a fight, so I guess they are feeling unhappy.
   The couple is having a fight, so they  happy. 
8.I am sure the student got  an A- because he looks satisfied.
   The student   an A- because he looks satisfied.
9.As I can see, he isn't leaving, he  is just going to the bathroom!
   As I can see, he , he is just going to the bathroom!
10.Perhaps she likes cats more than dogs.
   She  cats more than dogs. 
 
    

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