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finishing doing to finish doing to finish to do to finish do
do did am doing was doing
spend; to do spends; to do spends; doing spent; doing
lets，doing makes，doing makes，do lets，to do
am doing will finish was doing have finished
to do, took to do, spent doing, took doing, spent
finishing to do finishing doing to finish to do to finish doing
finishing to do finishing doing to finish to do to finish doing
to go；to do to go；doing going；to do going；doing
takes, doing takes, to do spends, and to do spends, doing
spends…doing takes … to do takes… on spend … to do
doing homeworks doing homework to do my homework do homework
finishing to do finishing doing to finish doing finish to do
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