You use 'I' in a sentence when you are telling someone about yourself or when you are giving your opinion about something.
E.g. 1)I don't like ice-cream.(about yourself)
2)I don't think you should do that.(your opinion about something)
You use 'me' in sentences like "This matter doesn't concern me" etc.
You use it when you are talking about yourself.
I is used in the subject (beginning) part of a sentence.
Example:
-I like eating chocolate.
-Rachel, Tom, and I were late for maths class.
Me is used in the predicate part of a sentence .
Example:
-Why are you looking at me?
-You and me shall go to the shops.
Edit:
-You should go to the mall with me.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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