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 Sentences :
Type 1 :
The if-clause is in the present tense, the main clause uses will and the infinitive, or simple present.
Example :
If I find her address, I will send her an invitation.
I will send her an invitation if I find her address.
If I don’t see him this afternoon, I will phone him in the evening.
If I find her address, I’ll send her an invitation.
If John has the money, he will buy a Ferrari.
If he has time, he will take a walk in the park.
Our cat never will eat if we leave her in the house alone.
We will not go skating if you think the ice is dangerous thin.
If you keep driving on this speed, we may arrive at home before 10 p.m.
You must bring an umbrella if you don’t want to get wet.
If Bob tidies up the kitchen, Anita will clean the toilet.
Elaine will buy the drinks if somebody helps her carry the bottles.
Type 2 :
The if-clause is in the simple past or the past continuous tense, the main clause uses would and the infinitive, or would be and the present participle (Verb-ing).
Example :
If you needed help, we would help you.
Fact : You didn’t need help, so we didn’t help you.
I would not help her unless she asked me.
Fact : I will help her because she had asked me.
If I had a lot of money, I would lend you some.
Fact : I don’t have much money.
Fact : I don’t have much money.
If I were you, I would not do this.
Fact : I am not you
If I found her address, I would send her an invitation.
Fact : I don’t have your address.
If John had the money, he would buy a Ferrari.
Fact : John don’t have money.
If the teacher didn’t speak quickly, I could understand better what he is teaching about.
Fact : the teacher speaks quickly, so that, I can’t understand well what he is teaching about.
Type 3 :
The if-clause is in the past perfect or the past perfect continuous tense, the main clause uses would have and past participle (Verb 3), or would have been and present participle (Verb-ing).
Example :
If he had been there, I would have explained the matter.
Fact : He had not been there, so I don’t not explained the matter.
If the weather had been nice, they would have played football.
Fact : The weather is bad.
If we had gone to a good restaurant, we would have had a better dinner.
Fact : A restaurant is not good.
If John had learned more words, he would have written a good report.
Fact : he didn’t learned
If the boys had taken the bus to school, they would have arrived on time.
Fact : He didn’t taken.
If the teacher had explained the homework, I would have done it.
Fact : Teacher didn’t explained the homework
If I had studied hard, I would have passed the exam.
Fact : I didn’t study hard, so I didn’t pass the exam.
I would have come to your house if the weather had been fine.
Fact : The weather wasn’t fine, so I didn’t come to your house.
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