clauses after "wish", "if only":
* Wish: ao ước.
* If only: giá mà, phải chi.
* Sau Wish và Only người ta thường dùng một mệnh đề chỉ điều ao ước, một điều không thật. Nó được xem như một mệnh đề danh ngữ (Noun clause)
* Có 3 loại mệnh đề sau Wish và If only được dùng để chỉ sự ao ước ở tương lai, hiện tại và quá khứ.
1. Future Wish ( ao ước ở tương lai)
S + wish + S + would + Verb (bare -inf.)
If only + would + Verb ( bare -inf.)

 + I wish I would be an astronaut in the future.
+ If only I would take the trip with you next Sunday.
+ If only I would be able to attend your wedding next week.
2. Present wish ( Ao ước ở hiện tại).
S + wish + S + Verb (past subjunctive)
If only + would + Verb (past simple; be (were

* Past subjunctive: Quá khứ giả định - Hình thức như Simple past.
+ I wish I were rich.( but I am poor now)
+ I can`t swim. I wish I could swim.
+ If only John were here. ( John isn`t here. I wish he were here)
+ We wish that we didn`t have to go to class today. ( but we have to go to class)
3. Past wish (Ao ước ở quá khứ)
S + wish + S + Verb (Past perfect subjunctive)
If only + S + could + have + PII

*Past perfect subjunctive: quá khứ hoàn thành giả định, hình thức như Past perfect.
+ I wish I hadn`t failed the exam last year. (In fact, I failed the exam)
+ She wishes she had had enough money to buy the house. ( She hadn`t have enough money to buy it)
+ If only I had met her yesterday. ( I didn`t meet her)
+ She wishes she could have been there. (She couldn`t be there)

Rewrite the sentences below, using "WISH" or "IF ONLY":
1. My father isn`t here now. I want him to be here now.
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2. You talk more than you work. The teacher wants you to work more than to talk.
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3. John would like to be an astronaut when he grew up.
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4. I`m sorry I didn`t help you yesterday.
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5. I regret that you didn`t give me a chance to tell you the truth.
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6. Mary is afraid she won`t be able to attend your wedding next week.
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7. We regret that we didn`t have enough money to buy that house.
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8. You drive too fast. I`d like you to drive more slowly.
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9. You are too lazy. The teacher wants you to be more studious.
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10. I`m not a doctor.
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11. I haven`t enough money to buy that book.
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12. I live in the city, but I don`t like it.
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13. Minh is sorry now that he didn`t accept the job.
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14. We have to work this Sunday.
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15. I feel sick because I ate too much ice -cream.
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16. It`s a pity that you were not here last week.
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17. I want the baby to stop crying.
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18. The hotel wasn`t good.
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19. I didn`t understand the lesson.
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20. My friend didn`t pass his exam.
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