First Conditional (in english language)

• First Conditional

• 
• Use the first conditional for real-life situations that could happen in the future. The first conditional talks about possible results that will likely happen.

  
  

  If + present simple, will + base verb*
  -If it rains, I will stay home. 

  
  

  You can also use can, must, or an imperative with the first conditional.
• If + present simple, can/must + base verb*

  -If it rains, you can stay home. / If it rains, you must stay home.
• If + present simple, imperative*

  -If it rains, stay home.
•  Click on the play button to hear the audio

• If the police catch the criminal, he will go to jail.	If you finish your homework, you can go to the party.
  If someone breaks into our house, call the police.	You must eat vegetables if you want to be healthy.

• *Remember! You can reverse all first conditional forms and use the second verb (will, can, must, imperative) first.

  I will stay home if it rains./You can stay home if it rains./You must stay home if it rains./Stay home if it rains.

 Source : Alison