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Scenario: There is a sale for this Sony LCD and it's $300. I bought it for $350 back then.

Are these correct? What do they mean?
1. I would save $50 if I hadn't bought that LCD back then.
2. I would have saved $50 if I hadn't bought that LCD back then. (Is it incorrect to use past perfect here? I wouldn't have saved anything back then right? It wasn't on sale before? So should I use the present tense imaginary 'would' instead? It is on sale now?)

Thanks.
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Comments  (Page 5) 
Thanks for all help so far guys.

To make it clear, I have few more questions to ask.

Scenario: I went throught a red light and I saved myself from getting into an accident.

So which one should I use?
1. If I didn't speed through the red light, I would've gotten myself into an accident. (I think I should use this one for the past action from learning the posts by you guys. )
2. If I hadn't sped through the red light, I would've gotten myself into an accident. (What about this one? When would I use this then?)

And these ones too:
3. If it wasn't for you, I would have died. (When would I use this one?)
4. If it hadn't been for you, I would have died. (When would I use this one?)

5. How would I suppose to know if I didn't read your post. (When would I use this one?)
6. How would I suppose to know if I hadn't read your post. (When would I use this one?)

Thanks.
JTT
The crucial point of all this is that is NOT a past tense here, it can't even have a past tense meaning.
Nobody (Jack nor PASTEL nor me) insisted 'would save' means 'past'. It is you who made a *** assertion that 'would save' would have future meaning. If you want to be a good teacher, please honestly apologize to students when you notice you made mistakes in your teaching. We (at least I) don't care that kind of mistakes by language teachers because we know even well literate people often make mistakes in understanding their own mother tongue. The teachers who their students would contempt most are those who repeatedly make silly excuses to hide mistakes they have made in teaching. It is a sincere advice to you from me who has 30 years' experience of teaching young people.

By the way I did a google survey myself. As I thought the absolute number of hits will not be significant in this case, I surveyed relative values of can/could and will/would. Here I confined sites into EDU domain because it seems many grammatically illiterate people (including children and foreigners) are contributing to pages of COM domain.
can have done / could have done 153/69,200
will have done / would have done 984/78,300

paco
Students: Are you brave enough to let our tutors analyse your pronunciation?
Nobody (Jack nor PASTEL nor me) insisted 'would save' means 'past'. It is you who made a *** assertion that 'would save' would have future meaning. If you want to be a good teacher, please honestly apologize to students when you notice you made mistakes in your teaching. We (at least I) don't care that kind of mistakes by language teachers because we know even well literate people often make mistakes in understanding their own mother tongue. The teachers who their students would contempt most are those who repeatedly make silly excuses to hide mistakes they have made in teaching. It is a sincere advice to you from me who has 30 years' experience of teaching young people.

JTT: {moved to "Teacher Errors" in Topic of the Moment}

By the way I did a google survey myself. As I thought the absolute number of hits will not be significant in this case, I surveyed relative values of can/could and will/would. Here I confined sites into EDU domain because it seems many grammatically illiterate people (including children and foreigners) are contributing to pages of COM domain.
can have done / could have done 153/69,200
will have done / would have done 984/78,300

JTT: {moved to the linguistics discussion forum}
JTT, could you help me out with my post above please? Thanks. Sorry for keep asking the same qestions over and over again. I just need a few more examples.
Hello Jack
Scenario: I went throught a red light and I saved myself from getting into an accident.
So which one should I use?


No, you wouldn't use #1 in this scenario. You would use #2:

2. If I hadn't sped through the red light, I would've gotten myself into an accident.

You are talking about something which could have happened in the past, but didn't: so you use type 3.

3. If it wasn't for you, I would have died. (When would I use this one?)

Likewise. With 'to be', 'was' can sometimes take the place of 'had been' in these constructions, as it's a stative verb. 'Was' stretches back and includes the period covered by 'had been'.

4. If it hadn't been for you, I would have died. (When would I use this one?)

Likewise; you are talking about something which could have happened in the past, but didn't: so you use type 3.

5. How would I suppose to know if I didn't read your post. (When would I use this one?)

You want: 'how am I supposed to know, if I didn't read your post?'

6. How would I suppose to know if I hadn't read your post. (When would I use this one?)

You want: 'how was I supposed to know, if I hadn't read your post?'

MrP
Site Hint: Check out our list of pronunciation videos.
Okay so to clear things up:
-I use past perfect for things that could have happened?

- I use past tense for things that happened?

Scenario: My dad asks me if I took his car key yesterday and he says:

1. If you didn't do it , you wouldn't have to worry .
2. If you hadn't done it, you wouldn't have to worry.


How come for this key scenario, I use #1? Also for #1, am I saying that it happened? I took his keys? Not could have happened?

But my car scenario doesn't work? I use #2? I don't see the difference.
Scenario: I went throught a red light and I saved myself from getting into an accident.

3. If I didn't speed through the red light, I would've gotten myself into an accident.
4. If I hadn't sped through the red light, I would've gotten myself into an accident.