Q: i gave him a piece of my mind とはどういう意味ですか?
A: It's an idiom. To tell someone how he/she feels. To say something, or to speak to someone in an angry way. Example:

'I'm going to go give her a piece of my mind about it.'
Q: i gave it my all. and i got shark number two とはどういう意味ですか?
A: to give it your all:
•to put all of your energy and effort into something
•to give something your best effort
•to try as hard as you can

"Don't worry. You gave it your all."

“I give it my all when I’m out on the pitch.” - Oswaldo Sanchez (former goalie for Mexico's soccer team)

I'm not sure what "I got shark number two" means.
Someone recieved something called Shark #2 (??)
Q: i gave it a pass とはどういう意味ですか?
A: It depends on the context.
'I ignored it.' or 'I agreed to it.'
Q: i gave the girl a moment to calm down before とはどういう意味ですか?
A: You left her alone for a little while to stop freaking out
Q: what if i gave you what you wanted? とはどういう意味ですか?
A: hypothetical of giving someone what they want


Q: i gave returns gift to all friends. は 英語 (イギリス) で何と言いますか?
A: I have given return gifts to all my friends.
Q: i gave in the invitation or i gave in my daughter go to the party ( two sentences are right? は 英語 (イギリス) で何と言いますか?
A: 1) i am allowing my daughter to go to the party

2) i gave permission to her (your daughter) to go to the party..

3) She can go to the party..


Q: i gave him an absent look この表現は自然ですか?
A: I think it’s pretty good 👌
Q: i gave a letter for wife and daughter because today is anniversary. この表現は自然ですか?
A: Sounds good! I would add "to" and "our" in.

"I gave a letter to my wife and daughter because today is our anniversary."
Q: i gave him a smart comeback when he made fun of me with my embarrasing weakness. この表現は自然ですか?
A: I would suggest "I gave him a smart comeback when he made fun of an embarrassing weakness of mine."
Q: i gave my friend a compliment and she replied " i'm humbling". what does she want to say?
A: She actually said, "I'm humbled." What she means there, is, "Your compliment moved me greatly, and I truly appreciate it. Thank you very much."