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Who's that? Who are you? I'm speaking. I'm Mr. Wang.
must be should have been might have been can’t be
I am Mr. FreD. Speaking. Who are you? Who are you looking for?
who' s that who are you I' m speaking I' m Mr Wang
who' s that who are you I' m speaking I' m Mr Wang
Miss Smith, Mr. Hunt. Mr. King. Mr. Brown.
may; mustn't might; may not can; can't could; mustn't
shouldn’t mustn’t can’t needn’t
Mr. Liu was, who taught us English was Mr. Liu, who taught us English was who taught us English, Mr. Liu Mr. Liu, who taught us English, was
Mr. Liu was, who taught us English was Mr. Liu, who taught us English was who taught us English, Mr. Liu Mr. Liu, who taught us English, was
if had it not been is it not being had it not been its only having been
who' s that who are you I' m speaking I' m Mr Wang
an;some an;a some;a some;some