• Se forma con if + simple present + simple future. Se emplea cuando una situación es real o posible: If it rains today, I'll stay at home. Aquí ay  algunos ejemplos traducidos
• If clause	Main clause
  If + Present tense	will / can / may / must + verb
  If it rains today,	I'll stay at home

  If it rains today, I'll stay at home.

• Si llueve hoy, me quedaré en casa.

• If he is busy now, I will come back tomorrow.
• Si está ocupado ahora, regresaré mañana.

• If it is cold, you must wear warm clothes.
• Si está haciendo frío, deberás  usar ropa abrigada.

• if you eat too much you get fat
• si comes demasiado te engordas

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if he didn't live by the river,he couldn't go fishing

si el no viviera cerca al rió no podría ir a pescar

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• If I saw her, I would ask her out.
  Si la viera, la invitaría a salir.

if you don't sleep enoungh, you feel tired 

Si no duerme lo suficiente, se siente cansado

if you wont to succeed in life,you have 
to work hard

si usted quiere tener éxito en la vida, tienes que trabajar duro

if people don't eat they die 
si la gente no come ellos mueren 

if you do a lot ot gym you stay fit
 si usted hace ejercicio se mantendrá en forma

If Britney Spears (hit) …………… the paparazzi, she (be) ……………. in a serious trouble.

If he (listen) …………… to the teacher, he (understand) …………… the lesson.

If you (touch) …………… the owen, you (burn) …………… your hand.

If she (break) …………… the window, her parents (pay) …………… for it.

If they (go) …………… to the cinema, they (enjoy) …………… the movie.

If he (be) …………… intelligent, he (solve) …………… the problem.

If you (go) …………… to the party, I (go) …………… with you.

If he (knock) …………… the door, I (not talk) …………… him.

If she (need) …………… a favour, I (do) …………… it.

If your car (be) …………… broken, the mechanic (repair) …………… it.