CONDITIONAL  IF
Conditional (Kalimat Pengandaian) menjelaskan bahwa sebuah kegiatan bertentangan dengan kegiatan yang lain. Conditional yang paling umum adalah Real Conditonal dan Unreal Conditonal, kadang-kadang disebut juga if-clauses
1.    Real Conditional (sering juga disebut juga dengan Conditional Tipe I) yang menggambarkan tentang mengandai-andai sesuai dengan fakta. 
2.    Unreal Conditional (sering juga disebut sebagai Conditional Tipe II) yang menggambarkan tentang pengandaian yang tidak nyata atau berimajinasi. 
3.    Ada juga Conditional yang ke-3 yang sering disebut dengan Conditional Tipe III, digunakan sebagai penyesalan yang terjadi di masa lampau dan zero conditional, digunakan untuk mengekspresikan sesuatu yang sudah pasti benar. 
Note : Jika  klausa "if" diletakkan di awal kalimat, kita harus menggunakan �koma�. Sebaliknya jika klausa "if" berada di belakang, maka tidak perlu ada koma
Conditional sentence adalah kalimat pengandaian yang terdiri dari 3 tipe, yaitu:
There are 3 kinds of conditional sentence 
Ø  True in the Present / Future Time 
Ø  Untrue in the Present / Future Time 
Ø  Untrue in the Past Time 
a.      True in The Present / Future Time
Rumus :
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 . 
The function is to show / explain plan, advice, and possibility / probability 
For example 
·         If you don't have breakfast, you will be hungry. 
·         If the magazine is on my table, you can take it. 
·         If you come early you will not get punish from our headmaster.
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.
b.      Untrue in the Present / Future Time
Rumus :
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 .
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 . 
The function of conditional sentence type two is to explain our imagination. 
For Example 
• If the price of gasoline were only Rp. 1000 I would be very happy. 
• What would you do if you found $100.00 on the street. 
• If I had a lot of money, I wouldn't stay here.
Use    Conditional Sentences Type II refer to situations in the present. An action could happen if the present situation were different. I don't really expect the situation to change, however. I just imagine „what would happen if …“ 
Example: If I found her address, I would send her an invitation . 
I would like to send an invitation to a friend. I have looked everywhere for her address, but I cannot find it. So now I think it is rather unlikely that I will eventually find her address. 
Example: If John had the money, he would buy a Ferrari . 
I know John very well and I know that he doesn't have much money, but he loves Ferraris. He would like to own a Ferrari (in his dreams). But I think it is very unlikely that he will have the money to buy one in the near future.
c.       Untrue In the Past Time
Rumus:
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 .
Use 
Conditional Sentences Type III refer to situations in the past. An action could have happened in the past if a certain condition had been fulfilled. Things were different then, however. We just imagine, what would have happened if the situation had been fulfilled. 
Example: 
·         If I had found her address, I would have sent her an invitation . 
Sometime in the past, I wanted to send an invitation to a friend. I didn't find her address, however. So in the end I didn't send her an invitation. 
Example:
·         If John had had the money, he would have bought a Ferrari . 
I knew John very well and I know that he never had much money, but he loved Ferraris. He would have loved to own a Ferrari, but he never had the money to buy one. 
- If      I hadn't helped you, you would have failed. = You would have failed, if I      hadn't helped you. 
 - If      it had been sunny, we could have gone out. = We could have gone out, if it      had been. 
 
Sumber : 
2.  http://hitsuke.blogspot.com/2009/05/if-conditional-sentence.html
                   
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