Conditional Sentences

Conditional Sentences

            Conditional tenses are used to speculate about what could happen, what might have happened, and what we wish would happen. In English, most sentences using the conditional contain the word if. Many conditional forms in English are used in sentences that include verbs in one of the past tenses. This usage is referred to as "the unreal past" because we use a past tense but we are not actually referring to something that happened in the past. There are three types of Conditional Sentences.

Type 1 conditional

Form: if + Simple Present, will-Future

            The type 1 conditional is used to refer to the present or future where the situation is real. The type 1 conditional refers to a possible condition and its probable result. In these sentences the if clause is in the simple present, and the main clause is in the simple future.

Example: If I find her address, I’ll 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.

Type 2 conditional

Form : if + Simple Past, main clause with Conditional I (= would + Infinitive)

            The type 2 conditional is used to refer to a time that is now or any time, and a situation that is unreal. These sentences are not based on fact. The type 2 conditional is used to refer to a hypothetical condition and its probable result. In type 2 conditional sentences, the if clause uses the simple past, and the main clause uses the present conditional.

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.

Type 3 conditional

Form: if + Past Perfect, Conditional II (= would + have + Past Participle)

            The type 3 conditional is used to refer to a time that is in the past, and a situation that is contrary to reality. The facts they are based on are the opposite of what is expressed. The type 3 conditional is used to refer to an unreal past condition and its probable past result. In type 3 conditional sentences, the if clause uses the past perfect, and the main clause uses the perfect conditional.

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.

QUESTION !

1.      If you have enough time, please…………………..(clean) your room before you go to school.

A.    Clean

B.     Had clean

C.     Cleans

D.    To clean

2.      If she………………(know) there was a test, she would have prepared for it well.

A.    Were know

B.     Knows

C.     Know

D.    Had know

3.      If he…………….(be) more confident during the interview, he might have the job he wanted.

A.    Have

B.     Has

C.    Were

D.    Was

4.      If today………………….(be) Sunday, we could go to the beach.

A.    Has

B.     Were

C.     Have

D.    Was

5.      If I……………(do) a good job, I would get the raise.

A.    Did

B.     Have

C.     Had been

D.    Was doing

SOURCE

http://www.ef.com/english-resources/english-grammar/conditional/

https://www.ego4u.com/en/cram-up/grammar/conditional-sentences