Zero first second and third conditionals
If + present → present. Always true.
| Type | Structure | Use |
|---|---|---|
| Zero | If + present / present | general truth |
| First | If + present / will | real future possibility |
| Second | If + past / would | unreal present/future |
| Third | If + past perfect / would have | unreal past |
If + simple present → will + base verb.
If + simple past → would + base verb.