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even if unless so that as long as
after because while as soon as
was playing; did played; was doing was playing; was doing played; did
did; made was doing; made was doing; was making did; was making
was doing；when did；when was doing；while did；while
my father came back did my mom came my father back did my mom did my father come back my mom did my father came back did my mom
to do；to do doing；doing； doing；to do to do；doing
did do was doing were doing
doing homeworks doing homework to do my homework do homework
to listen not listen not to listen listening
was doing; watched did; was watching did; watched was doing; was watching
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