Conditional Sentence

1. If + V1/be + Modal I + V1 (Real, mungkin terjadi)
ctt:  be (is,am,are,have/had)
       modal I (will,can,may)

ex:  If i have money, i will go to L.A
      If you eat breakfast, you will got enough energy

2. If + V2/were + Modal II + V1 (Unreal, bertentangan dengan sekarang)
ctt:  modal II (could,would,should,might)

ex:  If i were a president, i would over come the corruption
      (i am not a president)
      If she want there now, she would met him
      (she is not going there)
      If i were you, i would go with him
      (i am not you)

3. If + had V3/had been + Modal II + have + v3 (Unreal, bertentangan dengan masa lalu)
ex:  If i had been a president, i would have jailed the corruptor
      (i was not a prsident)
      If you have gone there yesterday, you would have met him.