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I have no   .I have to study hard.

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can    should    could    shall  
study  studied  have studied  had studied  
not to study    not studying    have not studied    did not study  
the all day    the whole day    whole the day    whole day  
Have I  I have  Had I  I had  
must;must   had to;have to   had to; must   have to;must  
have been working    was working    have worked    worked  
should study    may have studied    should have studied    must have studied  
I'm going to see my grandma this Sunday  I'm going there with Tom  I have to study for a test  I have no time this Sunday  
used to learn    was used to studying    have studied    didn’t use to study  
study    studying    learning    studied  
am studying    was studying    will study    would study  
unless    if    while    when  
to have studied    to study    to be study   to have been studying  
studying    having studied    to study    to have studied  
to have studied  to study  to be study  to have been studying  
to have studied  to study  to be study  to have been studying  

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