CATEGORY ： ESL IF 2007/01/18 Thu TB ： CM ： 0 △

If (present), - will ...
If (past), - conditional (would/could/might) ...
If (Past Perfect), - conditional past (ex: would have done) ...

If I see the first one, I will see the second one.
If I saw the first one, I would see the second one.
If I had seen the first one, I would have seen the second one.

Absolute, Scientific Results

- If a catalyst is used, the reaction occurs more rapidly.
- If a catalyst is used, the reaction will occur more rapidly.

Probable Results for the Future

- If we find her address, we will write her.

Probable Change in the Past Results

- If we found her address, we would write her.
- If we had found her address, we would have written her.

Impossible Results

- If the party were on Friday, we could go.
* in this case, we use "were"(subjective) for all.
For example;
- If she were here, I would talk to her.
- If it were black, I would see it.