昨日どこにいたのって英語でなんて言うの？

First two examples use helping verb do in past form (did) showing action in past. Both followed by main verb in base form as it doesn’t need to change. Third example uses linking/state of being verb to be in past tense (were).

These two questions have basically the same meaning, but I would say "Where did you go?" if you know the person left and went somewhere else.

"Where were you yesterday?": This is simply asking the person where they physically were yesterday. "What did you get up to yesterday?": This s a more casual way of asking a person what they did yesterday and in that way they could tell you where they were. I hope tat helps.

To ask someone where they were yesterday then you can simply say 'Where were you yesterday?' this may give a basic reply so to get more of a detaled answer then you might ask 'What did you get upto yesterday?' If you were meant to meet but didn't then you could ask 'Where did you get to yesterday?'

There are a number of ways you can say this. When you say "what did you get up to yesterday?" you are asking what the person was doing yesterday, but also implied is that they should tell you where they were. However, to be more direct/accurate you could ask: -Where were you yesterday? -I was looking for you yesterday. Where were you?

Native speakers will say like this: “Where were you yesterday?”. There are lots of other ways to say it, but this one is the most accurate and most commonly used. Here is an example on how to use this in a conversation: A: Where were you yesterday? B: I was at my grandparents house. Why do you ask?