Match the halves of the third conditional sentences.

Write one number (1–4) in each gap.

If you hadn't understood the third conditional, [ ]

Only if the scientist had done everything right, [ ]

Jack could have come on time [ ]

She could have participated in the competition last year [ ]

1. the experiment would have succeeded.

2. if she hadn't broken her leg.

3. if his car hadn’t broken down.

4. you should have looked at the examples.