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Pardon Thank you Excuse me Yes, thanks a lot
It; when What; that It; that What; when
tells; carry speaks; bring says; talk says; take
knocking down someone knocks at someone knocks into someone knocking about someone
couldn’t have been won’t be wouldn’t have been wouldn’t be
as good as not as good as as well as not as well as
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
when, shout while, shouting as, to shout when, shouting
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