The ’s can be used as a contraction representing a weak, unstressed word that is not pronounced. It allegedly cannot occur in sentence final position.
- She is not ready, but he is.
- She’s not ready, but he is.
- She’s not ready, but *he’s.
The last one is not grammatical there.
Similarly, here the last one is not grammatical:
- He has not started yet, but she has.
- He’s not started yet, but she has.
- He’s not started yet, but *she’s.
This answer claims this is because you cannot end a sentence with a weak form. It backs up its point with reasonably scholarly documentation.
However, this does not seem to be invariably true.
- Shall we go to the movies? Yes, let us go.
- Shall we go to the movies? Yes, let’s go.
- Shall we go to the movies? Yes, let’s.
Unlike the third example in the first two sets, here in this case the third example is indeed grammatical, despite ending with a weak form.
Is this an exception to the rule, or is there another rule at work here?
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