介绍:
1.If I had studied hard before, I _ (pass) the exam now.
2. But for your help, I _ (fail) at that time.
3. - Did you pass the driving test?
- No, I _ (pass) it, but I had little time practising.
4. John went to the hospital alone. If he _ (tell) me about it, I would have gone with him.
5. Tom was late for school yesterday. I think he _ ( miss) the bus.
