Here are two identical B2 points in the English Grammar Profile.
Point 56 in ADVERBS and Point 18 in NEGATION are defined by:
FRONT POSITION or INVERSION WITH ‘NEVER’ followed by an inverted subject (most commonly ‘I’) + main verb, to give focus.
This is quite a rare structure, so it stands out as being learnt at upper-intermediate.
. Never _v _p _v
1 . NEVER HAVE I SEEN 234
2 . NEVER THOUGHT I WOULD 206
Never thought I would say it, but I‘m a genius for making you stay outside and do a menial task.
3 . NEVER HAVE I BEEN 165
4 . NEVER HAVE I HAD 127
5 . NEVER DID I THINK 118
6 . NEVER HAS IT BEEN 102
7 . NEVER WOULD I HAVE 96
8 . NEVER LET IT BE 88
9 . NEVER HAVE I FELT 80
10 . NEVER HAVE I HEARD 57