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my foot; the store a foot; the store foot; store feet; stores
have studied had studied studied am studying
had would was going to did
didn’t meet ; would be hadn’t met; would be didn’t meet ; would have been hadn’t met ; would have been
not；won’t no；don’t not；haven't no；didn’t
went; didn’t go have gone; haven’t gone went; haven’t gone went ; hadn’t gone
Yes ,he didn′t No, he didn′t Yes ,he did No, he did
wasn’t allowed to allowed not to didn’t allow to was allowed not to
answered has answered was answering is answering
has left left was leaving had left
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