parenthetical expression

Question

i really dont understand them

the question i need help with is

Which of the following sentences with a parenthetical expression is punctuated correctly?
		Of course the girls couldn't wait, to jump in the pool on such a hot day.			Of course, the girls couldn't wait to jump in the pool on such a hot day.			Of course the girls, couldn't wait to jump in the pool, on such a hot day.			Of course the girls couldn't wait to jump in the pool, on such a hot day.

Answer 1

The parenthetical expression in your sentence is "of course," which is a transition that needs to be set off by a comma.

Answer 2

One way to determine which is correct is to read each statement out loud.

Place a pause at each comma and choose the one that sounds right to your ear, as if you were speaking to another person.

It should be clear which ones sound strange and which one doesn't.