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am watching was watching will watch watched
must have been had to be was to be must be
am watching was watching will watch watched
did , do does , do was , doing is , doing
am watching was watching will watch watched
went is going goes will be going
went is going goes will be going
went is going goes will be going
am watching was watching will watch watched
went is going goes will be going
am watching was watching will watch watched
went is going goes will be going
what you were doing what were you doing what you are doing what are you doing
went is going goes will be going
with，at to，with with，on on，with
went is going goes will be going
went is going goes will be going
must have been had to be was to be must be
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