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If I (1. didn't bother/ hadn't bothered) him with our problems so much last year he (2. would supply/ would have supplied) us with the required equipment. If we (3. didn't buy/ hadn't bought) a laptop for John, he (4. wouldn't be able, wouldn't have been able) to use the e-mail now. If the television (5. was not invented, hadn't been invented) in the 19th century, it (6. would be invented/ would have been invented) in the 20th. If James (7. had named/ named) some great discoveries in the history of human civilization, he (8. would get/ would have got) a good mark but his mark was poor. But for Isaac Newton the mankind (9. wouldn't know/ wouldn't have known) the law of universal gravity. I know your parents are very unhappy. If I (10. were/ had been) you, I (11. wouldn't be/ wouldn't have been) so indifferent to their problems. If they (12. had/ had had) various approaches to the problem, they (13. would tell/ would have told) us about them. Let s ask them about it. I wish we (14. could/ had been able to) always predict the near future. If Paul (15. were not/ hadn't been) a surgeon, he (16. would be/ would have been) in scientist now. If he (17. were not interested/ hadn't been interested) in science and technology, he (18. wouldn't enter/ wouldn't have entered) the Science Department of Manchester University. But he is among the best students.

If I (1.  hadn't bothered) him with our problems so much last year he (2.  would have supplied) us with the required equipment. If we (3.  hadn't bought) a laptop for John, he (4. wouldn't be able) to use the e-mail now. If the television (5.  hadn't been invented) in the 19th century, it (6.  would have been invented) in the 20th. If James (7. had named) some great discoveries in the history of human civilization, he (8.  would have got) a good mark but his mark was poor. But for Isaac Newton the mankind (9. wouldn't know) the law of universal gravity. I know your parents are very unhappy. If I (10. were) you, I (11. wouldn't be) so indifferent to their problems. If they (12.  had had) various approaches to the problem, they (13. would have told) us about them. Let's ask them about it. I wish we (14. could) always predict the near future. If Paul (15. were not) a surgeon, he (16. would be) a scientist now. If he (17. were not interested) in science and technology, he (18. wouldn't have entered) the Science Department of Manchester University. But he is among the best students.