Who and Whom
Most people use 'who' many times a day,
most probably in a question, however very few use 'whom', even if they should.
Who is used if talking about someone in the context that they would be addressed he or she. For example you would say:
Who are you? because you would be replaced to say he or she. This would make it Who is he/she? whilst Who is him/her? which doesn't make sense.
Whom is used when it would be replaced with him/her and when it would be used to refer to the object of a verb or preposition.
For example you would say: To Whom the letter is addressed... as you would say the letter is addressed to him/her.
Me and my Friends
My Friends and I
People often get these two confused and are unsure whether to say 'Me and ...' or 'My ... and I'. However, there is an easy way to remember this with the simple trick of taking out the other person.
For example:
You would say ' My friends and I went to the cinema' as if you take out the other person/s it becomes 'I went to the cinema' whereas you wouldn't say 'Me went out to the cinema'.
You would say 'Let me and my friends eat' because if you take out the other person/s it becomes 'Let me eat' whereas you wouldn't say 'Let I eat'...