Zero conditional
Structure: If/When/Unless+ Present Tense //// present tense / imperative- If the sum of the digits of a number is divisible by three, the number is divisible by three (Pres. tense)
- If you see Mr Fox tonight, tell him I am ill. (imperative).
When to use it:
Nature: When we talk about things that are generally or always true
Time: Present time and imperative
