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at；doing with；doing at；to do with；to do
do morning exercise do morning exercises doing morning exercise doing morning exercises .
is doing was doing has done has been doing
is doing was doing has done has been doing
at; in doing with; in doing al; to do with; to do
has been doing had been doing did was doing
was you doing were you doing are they doing does we do
did my homework am doing my homework do my homework was doing my homework
is doing was doing has done has been doing
was doing did is doing would do
am doing was doing do did
at eight yesterday morning yesterday morning eight yesterday morning at eight by eight yesterday morning
was, doing are, doing is, doing were, doing
did was doing has been doing had been doing
Do；exercise is Do；exercises is Doing；exercises are Doing；exercises is
was doing did is doing would do
what are you doing what you are doing what you will be doing what will you be doing
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