The following is an example of telephone conversation. The topic of the conversation is giving suggestion.
Rina is watching TV. Suddenly her mobile phone is ringing.
Rina : Hello, Sani..
Sani : Hi, Rina. I have a problem.
Rina : What is it?
Sani : I'm going to have a test tomorrow. But, my book is lost. Can you help me?
Rina : No problem. You should come to my house now. I can borrow my book.
Sani : That's very kind of you. I'm coming soon.
Rina : Okay. I'm waiting.
Rina is hanging up the phone.
The underlined sentence is the expression of giving suggestion. You may use "You should ..." or "It is better for you to ..." to express suggestion.