- There's a misunderstanding (in) between us.
Is it natural with in or without? In which case should we add in?
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You can use in between when referring to something physical:
There is a puddle in between us.
But when referring to something intangible or metaphorical, stick with between:
There is some tension between us.
Note that, in the first case, the in is optional; one could just as well say:
There is a puddle between us.
However, the in reads awkwardly when talking about something more abstract, and should therefore be omitted:
We have a disagreement
Note: American English; other dialects may treat this differently