1.This bag is too heavy for me to carry. -> If...

2. You'd better bring a raincoat. It's going to rain. -> In case...

3. It was kind of you to help the poor. -> You were kind ...

4. He wasn't told about the accident. -> They...

5. I haven't heard from her for nearly 10 years. -> It's...

6. I didn't arrive in time to see them off. -> I wasn't...

7. Neither beer nor whisky is good for your healthy. -> Beer as...

 7/3.13 + 7/13.23 + 7/23.33 + 7/33.43

= 7/10.(1/3-1/13+1/13-1/23+1/23-1/33+1/33-1/43)

= 7/10.(1/3-1/43)

= 7/10 . 14/43

= 49/215