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David tells Jack that he (David) don't want to study. If he really wants to study then he would have attended all classes regularly. Is following sentence correct in this situation?

If I really wanted to study, I would have attended all classes.

I have studied four types of "if..., " sentences: conditional 0, 1, 2 and 3. The sentence above is not matching any of those types, but I heard someone saying like this.

Also, if this is not correct, can it be used in informal situation?

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    The sentence is fine. Although I've had said : If I really wanted to succeed, I'd have...... But this has nothing to do with grammar. Aug 13, 2021 at 15:27
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    If the classes are now in the past, it might be more logical to say "If I'd [I had] really wanted to study..." (meaning 'at the time the classes were taking place'). Aug 13, 2021 at 16:36

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Strictly speaking it would probably be more "correct" to use Past Perfect for the "unreal past" condition...

If I had really wanted to study, I would have attended all classes.

Note that I've used typographic highlighting there purely to draw attention to the extra word. But it does also give the speaker a better context in which to more emphatically convey how untrue that unreal condition was (in addition to existing really, which conveys a similar emphasis).

Also note that in other contexts, OP's use of the "Simple Past" verb form for the "irrealis" condition might more naturally reference an "unreal present", rather than unreal past. Hence...

If I wanted to study I would go to my bedroom (not ...would have gone)

...could mean either right now I would go to my bedroom if I wanted to study (but right now I don't, so I wont). OR it could be talking about what I habitually used to do (i.e. - a real situation that occurred repeatedly in the past, as opposed to a single hypothetical / unreal instance that never actually happened anyway!).


TL;DR: OP's text is "valid", in that it's commonly used. But it's certainly not beyond criticism.

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Meanings

The sentence is correct as is. If you change the tense to past perfect, it's also correct, but the meaning is different.

If I really wanted to study, I would have attended all classes.

With the simple past, it roughly means "In general, I'm a person who doesn't want to study, so I didn't attend my classes."

If I had really wanted to study, I would have attended all classes.

With the past perfect, it means "Back then, I didn't want to study, so I didn't attend my classes." This allows for the possibility that I now want to study.


Grammar

The conditional forms first, second, third and zero don't represent how conditionals really work.

Those conditional forms only apply when the time of the "if" clause is the same time as the "result" clause (the main clause).

Named conditional types:

  • Zero: general present + general present (real)
  • First: present/future + present/future (real)
  • Second: present/future + present/future (unreal)
  • Third: past + past (unreal)

But what happens if the condition is in one time ("I don't want to study"), but the result is in another time ("I didn't attend my classes")? This is where the list of "official" conditional types breaks down.

The reality is, there are only two types of conditional: real and unreal. If your grammar is good enough that you know the meanings of the basic tenses, you know how to change "real" clauses into "unreal" clauses, and you can do that with "if" clauses too, then you can create any kind of mixed time conditional you want.

In your example, the condition is present, the result is in the past, and the whole thing is in the unreal, so...

  1. ["I" + "not really want to study" + unreal + "if"] ==> "If I really wanted to study"

  2. ["I" + "not attend my classes" + unreal] ==> "I would have attended my classes"

Combine them and you get a natural conditional:

If I really wanted to study, I would have attended my classes.

Odd as it sounds, you can even express future conditions with past results:

We'll watch from here, and if she flashes the light twice (future), it means she left the back door open (past).

The only new rule is: both clauses must be real or both clauses must be unreal, real and unreal cannot mix.

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  • Thanks. It explains very clearly.
    – ramanujan
    Aug 14, 2021 at 8:29

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