I'm going to lie to my friend just so she can get a bad mark.
Do you often lie to your friend?
No, it's the first time for this one.
Lying to people is generally a bad idea. Especially for something as petty as making them get a bad mark on something. You should be honest with your friends so they can trust you.
I didn't know lying was a bad idea. My parents never taught me that.
Of course lying is a bad idea! It could really hurt the people you care about.