find and correct mistakes
1. It's the second time they visited us
2. The girl is not enough tall to touch the top of the shefl
3. I am going to playing chess with my friend tonight
4 . We last saw them since they had birthday party
5. You have to making sure children don't put anything into the electrical sockets
6. Nam drew the picture hisself because his sister didn't help him
7. He worked with people who could nether speak and hear
8. They staretd living in the city since 1990