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People use conditional sentence when they would like to give statement as a result or final action by using or producing a certain condition or requirement.

For examples:

I will give you a present if you help me.

The sentence above is build from two sentences, they are:

1. I will give you a present.
2. You help me.

To combine both sentences, we use a conjunction "IF". "If" is a spesific conjunction which is used to build a conditional sentence. Therefore, a conditional sentence can be called by other terms, like Conditional "if" or "If" Clause.

There are three types of conditional sentences in English, they are:

1. Type I
2. Type II
3. Type III

Conditional Sentence Type I

KEY : Use Simple Future Tense and Simple Present Tense to make a conditional sentence type 1.
Both tenses are in Present Form.
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For examples:

If she gives back his book, He will tell her the secret.

I have a question for the sentence.
Will he tell her the secret if she really gives back the book?. This (Type 1) means that the result will occur or be realized 50 % when she gives back the book. And, 50 % for not giving back the book. As a result, he will not tell her the secret.

Conditional Sentence Type II

Use Past Future Tense and Simple Past Tense to make a conditional sentence type 2.
Both tenses are in Past Form.

For examples:

If she gave back his book, He Would tell her the secret.

Take notice that the auxilliary will which is changed into Past Form (Would), not the verb /Tell/.

In this type, the certainty is nothing. I can say that, at present time, certainty is zero (0 %).

For example:

I would be a bee if you were a flower.

Present Value : I am not a bee and you are not a flower.

Conditional Sentence Type III

KEY : Use Past Future Perfect Tense and Past Perfect Tense to make a conditional sentence type 3.
Both tenses are in Past Perfect Form.

For example:

If she had attended the meeting, The chairman would have held an important discussion.

In the example above, the sentence is not true in the present time as well as in the past time. Let me say that this sentence (Type III) is the same as subjunctive (that I will post as soon as possible).


Context Structure here means how to construct the conditional sentences (Type 1,2 or 3).
When the conjunction "If" is used at the beginning of the clause, Place 'comma' before the second sentence (here is statement or result). Do not use punctuation /comma/ when the result is placed at the beginning of the clause.

Study this follows!

I will go to the party if she makes an appointment. (Using /if/ instead of /comma/)
If she makes an appointment, I will go to the party. (Using /comma/ instead of /if/)

So, What's the difference between them?
When the sub clause is placed at the beginning, that means that what to emphasize is at the beginning. But when the main clause is placed at the beginning, the point (What to emphasize) is at the beginning. It depends on the speaker what clause will be stressed to the listeners or other speakers.

Please visit me later to discuss again about Conditional Sentence in details ...