Question

Are speaker tags required everytime when speaker changes?

Answer 1

No. Not every time it’s necessary to put speaker tags.

Answer 2

Yes, using speaker tags is relevant every time the speaker changes as it resolves the ambiguity.  

However, it is unnecessary to use speaker tags too often. When there are more than two speakers, action beats can be used varying with speaker tags. Using the same verb like ‘said’ over and over again can be monotonous and takes the life out of the dialogue.  

Other verbs can be used along with modifiers to portray a better picture of a scenario.