When I study, I saw sentence like this:

Earthquake rupture has been thought to happen by enlargement of a crack.

There is a information for this sentence in my book and by the way "has been thought" was gap and it was the answer of book. The information briefly is:

Since there are no adverbs of time and the "to" that comes after the gap is taken into account, the Present Perfect Tense must be chosen.

Questions are:

  1. So, through this information, will I must to choose "Present Perfect Tense" when I see "to"?
  2. What if I say "that" instead of "to"? Would it be wrong?
  • Are you sure that's the sentence your book provides?
    – Nameless
    Commented Sep 28, 2021 at 14:27
  • Yes I'm definitely sure.
    – user123960
    Commented Sep 29, 2021 at 15:21
  • Is the sentence from a headline?
    – Nameless
    Commented Sep 29, 2021 at 15:49
  • If it is from a headline, then that would explain the omission of articles.
    – Nameless
    Commented Sep 29, 2021 at 16:04


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