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a; / the; the a; a the; a
where; while which; as when; after when; that
knock on knocking on knocks on to knock on
sleeping asleep sleepy sleeper
did she hear then she heard when she heard than she heard
Who is it Who are you What’s your name the same to you
knocked; did was knocking; did knocked; was doing knock; am doing
about to go to bed am going to bed was just about to go to bed have gone to bed
was knocking at knocked knocked at knock at
when; knocking when; knock that; knocking that; knock
is; knocking is; knock are; knocking are; knock
am going to bed just about to go to bed was about to go to bed have gone to bed
had I gone；someone knocked at I had gone；did someone knock at had I gone；did someone knock at did I go；someone knocked at
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