Choose the sentence below in which "of" is used correctly.

1) We should of left early.
2) The boys surrendered, but they should of fought.
3) The bird flew north of the beach.
4) The three firls might of broken the records.

I think it is #3, the others use the word "have"

You're right! :-)

Tahnks Ms Sue :o)

You're welcome, Sarah. :-)

You are correct. The sentence #3, "The bird flew north of the beach," uses "of" correctly. The other sentences (#1, #2, #4) use "of" incorrectly, as they should actually use "have" instead.

The correct choices for those sentences would be:
1) We should have left early.
2) The boys surrendered, but they should have fought.
4) The three girls might have broken the records.

To determine if "of" is used correctly, you can often replace it with "have" to see if the meaning of the sentence still makes sense.