Make Sure The Reader Knows Who is Speaking
Dialogue in texts are always fun to read and enjoy, but sometimes they are not used correctly therefor ruins the point of dialogues.
Things to remember when you are adding a dialogue is to make sure that the attributives don't cut the speaker off, and place them where the character would breath or take a pause.
BAD PLACING OF ATTRIBUTIVE
"Now, my boy, we shall
see," he said, "how well you
have learnt your lesson."
and another thing you should make sure never to do is to repeat dialogues cause no one wants to read the same thing over and over and over again.