The document discusses different types of conditional sentences in English:
1) Type 1 conditionals refer to probable future events and use the present simple in the if-clause and will/won't + verb in the main clause.
2) Type 2 conditionals refer to imaginary or unlikely present/future situations and use the past simple in the if-clause and would/wouldn't + verb in the main clause.
3) Type 3 conditionals refer to imaginary past situations and use the past perfect in the if-clause and would/wouldn't + have + past participle in the main clause.
![TYPE 1 Probable ,[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)