When you list two things a subject did in one sentence, you only name the subject once.
If there are two men in a sentence, you can't start the next sentence with He.
If there are two women in a sentence, you can't start the next sentence with she.
If a person said more than one sentence, put everything they said outside the inverted commas.
If there are two objects in a sentence, you can't use it in the next sentence.
If the part that starts with because, unless or if is at the end of the sentence, it is followed by a comma.