英文有冇所謂ga破折號a?

Using quotes (i.e. " ") will serve the purpose of emphazing certain wordings in the sentence. You may also change the wordings from regular to italics. I have also seen cases where you may use hyphens (i.e. - ). However, it really depends on the context of your composition.

冇 但係用依個符號" " 意思都 OK