combine each pair of these sentences , using if
1. recycle and we'll save natural resources.
2. be careful or you will fall ovwer the rocks
3. working too much can make you feel tired
4. don't be craeless or you will break the vase
5. ha can pass the exam , she has to work hark
1.if we recycle,we'll save natural resouces.
2.if you aren't careful,you'll fall over the rocks.
3.if you work too much,you can feel tired.
4.if you are careless,you'll break the vase.
5.if ha has to work hard,she could pass the exam.