The document discusses the second and third conditional tenses in English. The second conditional describes impossible future situations using the past simple tense for the if-clause and "would" plus the base verb for the result. The third conditional talks about conditions and their results in the past that did not happen, using the past perfect tense for the if-clause and "would have" plus the past participle for the result. Both conditionals discuss conditional sentences that cannot or did not happen.

1. SECOND CONDITIONAL AND
THIRD CONDITIONAL

2. Second Conditional
 The Second Conditional is used to talk about
'impossible' situations.
 Notice that we are thinking about a future
condition.We use the Past Simple tense to talk
about the future condition.
 We use would + base verb to talk about the
future result.
If condition result
Past Simple Would+base verb
If I were you I would buy a car

3. Third Conditional
 The third conditional we talk about
the past.
 We talk about a condition in the past that
did not happen.
 The third conditional is also like a dream, but
with no possibility of the dream coming true.
If Condition Result
Past Perfect Would have+past
participle
If I had won the lottery, I would have bought a car.