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He is studying h    for the math exam.

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studied   studying   to have studied   to be studying  
will have been studying    would have been studying    will study    studied  
has studied    studied   will have been studying    had been studying  
to study   studying   to be studying   to have studied  
studied  studying  to have studied  to be studying  
to study    to be studying    to have studied    studying  
A. to study    to have studied    to be studying    that he is studying  
studied    studying    to have studied   to be studying  
study   studies   studying   is studying  
had been studying    was studying    will have been studying    has been studying  
was studying    would have been studying    had been studying    will have been studying  
studying; to study    to study; studying    studying; studying    having studied; to study  
used to living;to study  used to five;studying   used to living;studying  used to live,to study  
to study    to have studied    to be studying    to have been studying  
studied    studying   to have studied    to be studying  
always study   always is studying   is always studying    studies always
  
studied    studying    to have studied    to be studying  

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