1. - Mum , shall I help you ?
- Oh , no. I have already done everytrhing.
2. - Shall I give you a hand ?
- Oh, yes. I am very tired.
3. - Shall I clean the kitchen? Are you very tired?
- It's OK. I've already cleaned it.
4. I'll do the shopping .
- Shall I buy anything for you?
- Buy some milk, please .