Here are the rewritten sentences and questions using "going to":
- Joe is going to buy a new computer next year.
- We are not going to play tennis this weekend.
- Is Nick going to join the sports club?
- What are you going to do next summer?
- Look! That tree is going to fall over!
- Are you going to work hard this year?
- I am not going to get a new car.
- It is going to rain tomorrow.
- Are Mike and Pat going to make sandwiches for the party?
- It is going to snow.