in the same way as. Some people consider this use to be incorrect:
No one else can score goals like he can!
Don't talk to me like you talk to a child.
used when you are repeating something that you have already said:
Like I said, I don't mind helping out on the day.
I'm sorry, but, like I say, she's not here at the moment.
as if. Some people think that this use is not correct English:
He looked at me like I was mad.
It looks like it's going to rain.
This meat smells like it's gone bad.