This is another post that points at overlapping points on the English Grammar Profile. Parts of two points are worded differently but basically locate the same structure for “should” starting a sentence. The only noticeable difference for these points in succession is that one is labelled as conditional and the other located in a “formal context”. The reality is that both sets of examples seem to meet those criteria.
Point 110 also directly clashes with a “higher” level of C2 for the same structure which is more of a problem when using the EGP. Here it is not merely redundant like the differences between 109 and 110, but actually leaves the users wondering what level to give to this “third conditional”. The clearest example of similarity is the “Had we known…” The examples at both levels use past perfect and could be considered to imagine how the past may have been different.
Points 109 & 110 in clauses
INVERTED CONDITIONAL ‘SHOULD‘ C1 ‘should’ + inverted subject.
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INVERSION subordinated C1 inverted ‘should/had/were’ + subject + verb, in formal contexts.
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Had we known that before we could have taken more money with us.
Were I able to travel to any place and time, I would probably choose the Greece of more than two thousand years ago.
Then there is point 134 in clauses:
INVERTED PAST PERFECT, IMAGINED PAST conditional C2 past perfect + inverted subject, and a modal verb + ‘have’ + ‘-ed’ in the main clause to talk about imagined situations in the past.
Had he been more experienced he would have known that these things always happen in this part of the world.
Had we known this fact we would have organised more activities within school hours.
Had we learnt from the mistakes of the past, we would have given up fighting each other a long time ago.
Had I known so many people from abroad were coming to visit our stand, I would have studied harder during my private lessons in the past.
Had this file fallen into enemy hands, it might have had disastrous effects on the Western world.
Had public transportation been an option I would have chosen that instead of my car.
A search on iWeb corpus for:
. Had * _v?n*
1 . HAD IT BEEN 1368
2 . HAD I KNOWN 1172
Sadly, iWeb won’t accept more than 4 spaces to the right for a search. Still, looking at the top 10 collocates 4 spaces to the right of this “Had I known” Ngram, we get:
1 WOULD 338
However, what we would expect to find is the usual “would have + past participle”, but in actual fact what we mostly get is a clause before it without a relative pronoun:
2 THIS 231
3 WHAT 121
4 ABOUT 119
5 THEN 65
6 HOW 64
7 KNOW 58
8 GOING 46
9 BEFORE 36
10 BEFOREHAND 17
3 . HAD I BEEN 1057
4 . HAD HE BEEN 867
5 . HAD THERE BEEN 760
6 . HAD THEY BEEN 540
7 . HAD THIS BEEN 441
8 . HAD SHE BEEN 295
9 . HAD WE BEEN 277
10 . HAD HE DONE 241
11 . HAD THEY DONE 197
12 . HAD I HAD 179
13 . HAD I DONE 170
14 . HAD THAT BEEN 169
15 . HAD YOU BEEN 160
16 . HAD HE LIVED 141
17 . HAD WE KNOWN 135
18 . HAD N’T THOUGHT 125
19 . HAD WE HAD 103
20 . HAD I GONE 101
21 . HAD I SEEN 99
22 . HAD I USED 97
It should be remembered though that these are not necessarily inversion, but could be the start of questions starts. Still, we can get an idea of how frequent the “Had I known” Ngram is.