Use 'in to' when 'in' and 'to' belong to different constituents in the sentence. For example, He [rushed in] [to save the child]. There is no motion 'into' anything as with He rushed into the room .
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Use 'in to' when 'in' and 'to' belong to different constituents in the sentence. For example,
He [rushed in] [to save the child].
There is no motion 'into' anything as with He rushed into the room.
CJ