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.

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

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• 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

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.

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• If I have time, I'll visit my parents this afternoon. 
  Si tengo tiempo, visitaré a mis padres esta tarde
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  if you don't  sleep enoungh,you feel tired 
  
  
  si tu no duermes lo suficiente te  sentirás cansado 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  if you wont to succed in life, you have to work hard 
  
  
  Si tu  quieres tener éxito en la vida, deves trabajar duro 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  if people don't eat they die
  si la gente no come ellos mueren 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   if you do a lot gym  you stay fit
  si tu haces ejercicio te mantendrás en forma 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  ACTIVITY 
  
  
  
  
  
  
  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.