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      If only / I wish + simple past     If only I knew how to use a computer. (I don’t know how to use a computer and I would like to learn how to use it); I wish I were a millionaire!   start learning
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      To express a wish in the present or in the future. The simple past here is an unreal past. When you use the verb to be the form is “were”.   
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      If only / I wish + past perfect     If only I had woken up early. (I didn't wake up early and I missed my bus.)   start learning
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      To express a regret. The action is past.   
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      I wish / if only + would + verb     I wish you wouldn't arrive so late all the time (I'm annoyed because you always come late and I want you to arrive on time)   start learning
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      To complain about a behavior that you disapprove. Expressing impatience, annoyance or dissatisfaction with a present action.   
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      There are three distinct types of I wish / if only sentences:    start learning
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      Wish, wanting change for the present or future with the simple past. Regret with the past perfect. Complaints with would + verb.   
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     start learning
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      http://www.myenglishpages.com/site_php_files/grammar-exercise-if-only-I-wish. php   
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      Decide whether these statements express    start learning
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     start learning
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      If only she had seen the doctor earlier. He could have saved her.    start learning
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      If only I traveled to New York.    start learning
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     start learning
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      Alice didn't get a good grade. She wishes she (work) harder.    start learning
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      Alice didn't get a good grade. She wishes she had worked harder   
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      Tom likes football very much. He wishes he (become) a professional football player.    start learning
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      Tom likes football very much. He wishes he became a professional football player.   
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      He was running very fast when he had a heart attack. If only he (not/run) so fast.    start learning
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      He was running very fast when he had a heart attack. If only he hadn't run so fast.   
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      She's keen on computers. She wishes she (study) computer science next school year.    start learning
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      She's keen on computers. She wishes she studied computer science next school year.   
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      I am sorry I don’t know how to use the computer. If only I (know) how to use it.    start learning
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      I am sorry I don’t know how to use the computer. If only I knew how to use it.   
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      I stayed late at work and missed the last bus. I wish I (stay) at work late    start learning
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      I stayed late at work and missed the last bus. I wish I had not stayed at work late.   
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