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often use don’t often use doesn’t use often don’t use
reached lost missed caught
walking; to walk to walk; walking walk; to walk walk; walk
does; Yes doesn’t ;Yes does; No doesn’t; No
must have gone; hadn’t it been could have gone; had it not been could have gone; hadn’t it been; would go; had it not been
as long as; so as far as; that as often as; such as soon as; very
across；needn't across；mustn't through；can't through；mustn't
reached lost missed caught
across；needn't across；mustn't through；can't through；mustn't
not walk; not see not to walk; not to see not to walk; not see not walk; not to see
exploring are exploring have been exploring explore
reached lost missed caught
does, Yes doesn’t; Yes does; No doesn’t; No
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