1. The children can't go swimming because the sea is rough.
=> If
2. John is fat because he eats so many chips
=> If
3. They are poor, so they can't help us
=> If
4. Mary is shy, so she doesn't enjoy parties
=> If
5. I haven't got a key. That's why I can't get in
=> If
6. It's raining, so we can't have lunch in the garden
=> If
6. I don't know anything about him, so I can't tell you
=> If
7. She doesn't take any exercise, so she is overweight
=> If
8. I am bad at English. That's why I can't do homework
=> If
9. He doesn't practise speaking French, so he doesn't speak it fluently
=> If
giúp e với ạ :<