Rewrite

10. The dress is so expensive. She can not buy it. 

=> If………………………………………… …………………..………..

11. She doesn’t have an umbrella, so she gets wet.

-->If……………………………………………………………….…
12. You are so nervous because you drink too much coffee.

 --> If……………………………………………………………..…… 

13. I’ll call the teacher if you don’t leave alone.

 -->Unless ……………………………………………………..…………

14. I don’t tell you because you don’t ask me.

-->If  ………………………………………………………………………

15. If you don’t ask me for the car, I will not lend it to you.

-->Unless …………………………………………………………………