have trouble (with)
He is having trouble with his battery.
I am having trouble with this math homework.
The soccer player had trouble with his knee.
A: How are your tennis lessons?
B: Good, but I'm having trouble with my serve.
He is waiting to hear from the doctor about his tests.
I haven't heard from Dave recently.
It's nice to hear from you.
A: Has Mary called you since she went to China?
B: Not yet. If I don't hear from her soon I'm going to start worrying.
Have you ever heard of a two-headed snake?
I have never heard of an earthquake in this city.
Yes, I've heard of that restaurant. I think it's in the north end of town.
A: Let's go see a movie sometime.
B: Okay. If I hear of a good one I'll tell you.
help oneself (to)
He is helping himself to a cookie.
Help yourself to the cake.
At the buffet, everyone helps themselves.
A: Please help yourself to some pie.
B: Thank you. It looks delicious.
here you are
Here you are!
A: Could I use your pen?
B: Sure, here you are.
A: I would like a chocolate ice cream cone, please.
B: Here you are.
A: Can I have a sip of your water please?
B: Sure. Here you are.