Both can be correct.
A tip I heard is to remove the 'Some friends and' (or a persons name if this is the case) and if you would say I it should be I, if you would say me it should be me.
e.g.
CORRECT
Some friends and I are going to the movies. => I am going to the movies.
INCORRECT
Do you want to see a film with some friends and I? => Do you want to go and see a film with I?
CORRECT
Do you want to see a film with some friends and me? => Do you want to go and see a film with me?
Who is going to the woods? Mum and I are going to the woods
Whom shall I give these chocolates to? Give them to mum and me.
In the first line if you weren't with mum you would just say, "I am going to the woods". You wouldn't say "Me is going to the woods."
In the second line you would say, "Give them to me". You wouldn't say, "Give them to I" so you don't say it if you are listing who should get them. You could have said, and still been polite, "Give them to me and mum."
If you aren't sure in your head take the other people out of the sentence and only answer for yourself and you will work out whether you use I or me.
"My classmates and me" is traditionally preferred, but not really because of grammar; it was a 19th century convention of politeness to always refer to oneself last in a compound sentence element. Note, however, that neither of these forms is correct if the element is a sentence subject. In that instance, the nominative case form "my classmates and I" should be used.
Well, I couldn't think of any sentence that would make "some friends of you" sound grammatically correct so depending on how you use "some friends of your" - that's the best choice. An example would be something along of the lines like:
Both may be correct. My team and I are ready to go, but This is bad for my team and me.
If you would use 'I' in the singular, then use 'you and I'. If you would use 'me', then use 'you and me'.
You would say My sister and I......................
My colleague and I
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.
This sentence is grammatically correct.
This sentence is not grammatically correct. For the sentence to be grammatically correct, the space between "in" and "to" would have to be removed. Therefore the sentence should read "They are into skating."
"Not like that" can be grammatically correct, depending on the context.
Yes it is a grammatically correct
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
'Rhoda's crazy' is grammatically correct.
'What a drunkard you are' is a grammatically correct English sentence.
"For free' is grammatically correct. It is an idiom of the English language.
The sentence is grammatically correct.