Parallel structure involves different parts of a sentence that share the same function. In general, those parts should be in the same basic form. It is preferable that they be of similar lengths, although that is not absolute.Originally Posted by Atesttaker
I don't really have a problem with the first example. There are three elements that share the word "should" as an auxiliary verb. Therefore, each element must be able to follow "should" naturally, even if it were the only element listed.
that they should get plenty of sleep (OK)
that they should not eat too much (OK)
that they should do some warm-up exercises (OK)
It appears (logically) that all three elements are intended to share "before the game".
The only possible objection that I can see is the negative form of the second element. IMO, that does not seriously disturb the parallelism but others may disagree. If that is a problem, one can change #2 to a positive:
"eat only a small meal"
I will answer some others in subsequent posts so that each post is a bit more manageable. :wink: