'to give away' means to give something for free, for no payment.
- In this issue of the magazine, they are giving away a free CD
- I gave away all my old clothes that were too small for me.'to give back' means to return something borrowed.
- I still have your book at home. I must remember to give you it back.
- Every time he borrows money from me, he never gives it back.
'to give in' means to stop making an effort.
- You're doing really well. Don't give in now. Keep going.
- He has refused again and again. He's not going to give in and change his mind.
'to give out' means to distribute.
- As people arrive, can you give out these questionnaires for them to fill in.
- He was giving out leaflets on the street.
'to give out' means to break down or stop working from tiredness or overuse
- It was a very old machine. It's not surprising it has given out.
- My car finally gave out last week. I will have to buy a new one.
'to give up' means to stop doing something permanently.
- I haven't had a cigarette for over a month. I have given up smoking.
- I have given up playing football. I'm too old for it.
'to give up' means to abandon or end, a search for example.
- The key is nowhere to be found. We have given up looking for it.
- I've given up waiting for him. He is not going to come so I'm going home.