I want to be a fireman. Can I imitate sentences in grade one?

Does the subject want to ask "what can I do to imitate the sentence if I want to be a fireman in senior one?"

1, I want to be a fireman so that I can protect people's safety.

I dream of being a fireman, because I like helping others.

I want to be a fireman, because I want to learn how to deal with emergencies.