The document discusses different types of conditional clauses in English. It outlines four main conditional types: zero/real conditionals which express certainties, first conditionals which refer to possible future actions, second conditionals which refer to unlikely or improbable events, and third conditionals which refer to impossible or unlikely past events. It also discusses conjunctions like "unless", "as long as", "provided that", and "providing that" which can be used to link two clauses with an implied condition.

1. CONDITONAL CLAUSES
O CONDITIONALS ( eternal truths)
Condition Consequences
If-present simple Present simple
If you heat ice It melts
I CONDITIONAL(possible)
If-present Future/modal/imperative
If you come with us You will have a good time
You mustn’t worry
Let me know
If-present continuous Future
If they are coming We will have to buy food
II CONDITIONALS (probable)
If-past simple Conditional
If you came I would go with you
*If I were you I would study more
If I was you I would study more
III CONDITIONAL (impossible)
If-past perfect Conditional perfect
If you had come You would have met Peter
UNLESS=If not
I don’t watch TV unless there is an interesting programme
AS LONG AS, PROVIDED THAT, PROVIDING THAT,WETHER
They mean the same than if
I will let you my car as long as you take care
Provided that you study hard you will pass the exam
Travelling by car is convenient providing that you can park it