Replace "if" by "Unless"

1. Mary could go to the countryside with us if she weren't sick.

2. Tim would make that mistake if i didn't give him an advice.

3. If he didn't know the answer, he could ask me for help.

4. If they didn't receive your letter, they could change their mind.

5. If brother didn't lend me his car, i couldn't pick you up at eight.

6. If nothing happened to her, she could arrive Paris at noon.

Giải dùm mình vớiiiii nhé, mình cảm ơn mọi người 🫂🤭🥰