Then is commonly used for things happened in both the past and future.
In the common phrase now and then, is then in the past or the future? Could anyone help?
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It doesn’t have any temporally anchored reference. If you combine it with a past tense verb, it means “on randomly distributed past occasions”:
Combine with a future modal, it means “on randomly distributed future occasions”:
It is also acceptable with the present tense, in which case it refers to randomly distributed events before and after now:
Now and then or now and again is a phrase and means from time to time. So it could refer to past, present or future.