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must be must have been should should have been
could be done must be done could have been done must have been done
must be should be must have been should have been
may have been; can’t have been must have been; mustn’t have been may have been; must have been must have been; mustn’t be
have you did you haven’t you didn’t you
might be should be ought to have been must have been
might have been would have been should have been must have been
must be playing must play must have played must have been playing
could be done must be done could have been done must have been done
have you did you haven’t you didn’t you
should have done; may be could have done; must have been could have done; may have been must have done; might have been
must be must have been should have been could have been
I haven't seen you for ages how long have you been like this? where have you been these years? nice to see you again.
had studied hard; would have been should have studied hard; should have been had studied hard; would be would study hard; must have been
must have been would have been would be must be
I haven't seen you for ages how long have you been like this? where have you been these years? nice to see you again.
can be; mustn't be may have been;must have been may have been; can't be must have been ; can't have been
would have been can have been must be should have been
If ever;must be If so,must have been If ever,might have been If only;may be
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