, . .
, , . , II III .
| I | ( Future Simple) | If they know her address they will write to her. | , . | |
| II , | II, Past Simple |  should Simple
would Infinitive
could ( to)
might
| If they knew her address they would write to her. | , . |
| III , | II, Past Perfect | should Perfect
would Infinitive
could ( to)
might
| If they had known her address they would have written to her. | , . ( ) |
if ; unless ; provided
.
 |  |
If you use a dictionary, you will translate the text.
, .
 |  |
If I were not busy, we would discuss the details
today.
, .
|
|
 |  |
If I had received the letter I should have studied
yesterday, the payment terms.
, .
