Q: Valid English sentence (grammatically) or not: Here's a pole for you to kiss the girl who tied the string around.

A: unacceptable

Q: Valid English sentence (grammatically) or not: Emily showed himself to Benjamin in the mirror.

A: unacceptable

Q: Valid English sentence (grammatically) or not: Jasper wonders which book he should attempt to persuade his students to buy.

A:
acceptable