People often make mistakes with these two, including many native speakers of English (many seem to think that 'I' makes them sound more intelligent or posh, so it's not terribly unusual to hear things like 'He should ask Tom or I.').
The problem usually occurs when two or more people are referred to in the sentence (it is very rare indeed to hear somebody saying 'He should ask I.'). So... The easy solution is: Try the sentence with only I or me (we or us if you need a plural).
Examples:
Frank and I/me are going to the park. (I = we, me = us)
Us are going to the park. WRONG
We are going to the park. RIGHT
Therefore: Frank and I are going to the park.
Between you and I/me, this guy doesn't seem to know what he's talking about.
Between we... WRONG
Between us... RIGHT
Therefore: Between you and me, this guy doesn't seem to know what he's talking about.
Perhaps you and I/me should work together on this project.
Perhaps us should work together. WRONG
Perhaps we should work together. RIGHT
Therefore: Perhaps you and I should work together on this project.
The Grammar
I refers to the person performing the action of a verb. (The first person singular subject pronoun.)
I play the piano.
You and I should work together.
My wife and I watched a film.
Me refers to the person that the action of a verb is being done to (or the person a preposition refers to). (The object pronoun.)
He asked me to play the piano.
My wife gave me a present.
Between you and me, his cooking is terrible.
Can you use the subject pronoun and object pronoun together?
For example, would the following be OK?
He asked she and me to play the piano.
The answer is NO – it should be:
He asked her and me to play the piano.
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