Are these 2 examples both grammatically valid? Are there any differences in the tone or the meaning?
A. It may not seem strange.
B. It may seem not strange.
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Sign up to join this communityCase B. ("seem not strange") is rare to the point of oddity. It's used in two instances. The first is to bring a contrasting phrase with but close to the negation:
From The Last Guardian of Everness by J C Wright (2007):
[1] As in a dream shall all things seem, not strange, but familiar,....
The second is in conjunction with the now little-used subjunctive mood. From The Metaphysical Poets by T James (1988)
[2] [I]f by any occasion they be lost it seem not strange to us to pass it over.
Both A. and B. are grammatical and they mean the same thing, but given the age of some of the examples and the appearance of the construct in poetry, B. has (to me) a slightly archaic or literary tone.