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with; in at, on by; for to; on
has been was has left has gone
attending to to attend to attended to will attend to
eventual versatile extensive exclusive
located locating to locate locate
A. must can shouldn’t can’t
When was it that. Has When has Had
Have you seen Mr.Smith? Where has Mr.Smith gone? How about Mr.Smith? Hello, Mr.Smith.
went has gone have been has been
Having compared Having balanced Having observed Having examined
though before because since
eventual versatile extensive exclusive