Earlier quoted context omitted.
The difficulty of mastering the tenses is something that I think a lot of English speakers overlook. There's a lot of really precise and difficult-to-explain subtleties in English. (Of course, English isn't unique in this regard -- but I feel like certain things are taken for granted). Something that catches a lot of English as second language people out is the correct time to use the gerund form (i.e., the '-ing' fo…
Love that last example. I think "to have been being watched" is a bit of a reach though? "To have been observed / under observation" feels more natural. When translating it to french i got to "elle aurait dûe être observée". Incidentally, French has an easier time with this, I think because we have more options there. I couldn't reproduce the quirky structure at all, the flow is just more natural in french.
(1) She would have had to have been observed.
is that it misses out the gerund form preceding 'observed', which alters the meaning slightly in my opinion. It's difficult to get at precisely but I feel like the original sentence has a feeling of time-boundedness around when she was observed which you don't get without that gerund. I think?