Question

Are speaker tags required everytime when speaker changes?

Answer 1

Speaker tag is the simplest way to indicate which speaker or character is speaking the lines, as it contains the name of the speaker.

Speaker tags are not required every time when the speaker changes if the conversation is only between two people.

If there are more than two speakers, then speaker tags are indicative of the speaker, so it may be required to show which speaker is speaking the dialogue.

Answer 2

only on some occasion