conditional sentences

Conditional Sentences are also known as Conditional Clauses or If Clauses. They are used to express that the action in the main clause (without if) can only take place if a certain condition (in the clause with if) is fulfilled. There are three types of Conditional Sentence
IF Clause Type 1
Form
if + Simple Present, will-Future
Example: If I find her address, I will send her an invitation.
The main clause can also be at the beginning of the sentence. In this case, don’t use a comma.
Example: I will send her an invitation if I find her address.
Note: Main clause and / or if clause might be negative. See Simple Present und will-Future on how to form negative sentences.
Example: If I don’t see him this afternoon, I will phone him in the evening.
Use
Conditional Sentences Type I refer to the future. An action in the future will only happen if a certain condition is fulfilled by that time. We don’t know for sure whether the condition actually will be fulfilled or not, but the conditions seems rather realistic – so we think it is likely to happen.
Example: If I find her address, I’ll send her an invitation.
I want to send an invitation to a friend. I just have to find her address. I am quite sure, however, that I will find it.
Example: If John has the money, he will buy a Ferrari.
I know John very well and I know that he earns a lot of money and that he loves Ferraris. So I think it is very likely that sooner or later he will have the money to buy a Ferrari.
IF Clause Type 2
Form
if + Simple Past, main clause with Conditional I (= would + Infinitive)
Example: If I found her address, I would send her an invitation.
The main clause can also be at the beginning of the sentence. In this case, don’t use a comma.
Example: I would send her an invitation if I found her address.
Note: Main clause and / or if clause might be negative. See Simple Past und Conditional I on how to form negative sentences.
Example: If I had a lot of money, I wouldn’t stay here.
Were instead of Was
In IF Clauses Type II, we usually use ‚were‘ – even if the pronoun is I, he, she or it –.
Example: If I were you, I would not do this.
IF Clause Type 3
Form
if + Past Perfect, main clause with Conditional II
Example: If I had found her address, I would have sent her an invitation.
The main clause can also be at the beginning of the sentence. In this case, don’t use a comma.
Example: I would have sent her an invitation if I had found her address.
Note: Main clause and / or if clause might be negative. See Past Perfect and Conditional II on how to form negative sentences.
Example: If I hadn’t studied, I wouldn’t have passed my exams.

Conditional Sentences
1. Pattern If – Clause , Main Clause
OR
Main Clause if – clause

2. 5 Type of Conditional Sentence
1. Fact : If we put sugar into the water , it dissolve
2. Future Possible : If it rain , I won’t go out.
3. Present Unreal : If I were you , I would kill him.
4. Past Unreal : If he had driven carefully , he wouldn’t have had an accident
5. Mixed 4 + 3 : If I had eaten my breakfast this morning , I wouldn’t be hungry now.

3. How to omit “If”
: If it rains , Should it rain ,
: If I were you Were I you ,
: If I taught math Were I to teach math ,
: If he had driven Had he driven ,

4. Unless = If – not
: If it doesn’t rain , Unless it rains ,
: If I didn’t work here, Unless I worked here ,
: If I hadn’t met her, Unless I had met her ,

5. If = Providing (that) , provided (that)
= supposing (that) , suppose (that)
= on condition that
= if only
= only if

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