Comment by scrollaway

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.