Unit 28: CAN
Can is a modal verb. Unit 27 shows you how to make correct sentences with it. This unit shows you when you can use it.
She can assist a customer.
He is an employee but he cannot make a sale.
NOTICE: cannot is one word
Can you see the sale sign?
I can't see the small one.
EXAMPLE: I'm afraid I can't see you this week but I can next week.
NOTICE: also be able to (Unit 36)
EXAMPLE: Saturdays can be be very busy days to shop.
You can't be shopping now, you don't have any money.
They can't have got their money back. They didn't have their receipts.
NOTICE: use must (Unit 33) for strong probability
You cannot return merchandise without a receipt.
Customers can return merchandise with a receipt.
NOTICE: more friendly than may (Unit 30)
Can I pay by debit?
Can I have a receipt please?
NOTICE: could (Unit 29) is more polite
Asking for help
Can you give me a hand?
Can you tell me the time?
Can I help you?
Can I get you a larger size?