anythings wrong please tell me thanks...

1. kind
-It was kind of you to help us.
-what kind of tree is this?

2. mean
-He took a mean advantage of me.
-I was meant as a joke.

3. flat
-The flat of the hand.
-A floor must be flat.

4. can
-Can you lift this box?
-I want buy the canned fish.

5. play
-The children are at play.
-The children are playing

6. train
-I'm on the train now.
-Tonight trainning on 9pm.

7. ring
-The men were stading in a ring.
-Start work when the bell rings.