Read and study the dialog Dialog.
 

Nina: Hi, Sandra. What's the matter? You look confused.

Sandra: Well, I don't know what should I do to my friend.

Nina: Tell me your problem, then.

Sandra: My friends is always asking me to copy my homework. I want to tell her to do her own assignments but... I'm afraid she will be angry with me.

Nina: I think you shouldn't always lend your homework all the time. You can help her to do the assignments until she can do them independently.

Sandra: Ok. Thanks for your advice.

After reading the dialog above answer questions, which sentences in the previous dialog are used to suggest?