Q: Valid English sentence (grammatically) or not: work out an analysis that is typical of this view of understood subjects.

A: acceptable

Q: Valid English sentence (grammatically) or not: Sally might have eaten cabbage, but Holly shouldn't.

A: acceptable

Q: Valid English sentence (grammatically) or not: The more people you say that right after the show opens will buy tickets, the happier I'll be.

A:
acceptable