f you don’t look after tomato plants, they die very quickly.
Prawns are very risky to eat if they haven’t been kept at the right temperature.
If she’s travelling abroad on business, she always phones me every evening.
If you can read this, you're driving too close to me.
If we chip pan sets alight, throw a fire blanket, not water, on it.
situations that can occur:
1) at any time (present, past, future)
2) often more than once
3) always have the same results
:pencil2: we can use an imperative instead of present tence in the main clause
If I eat dairy products, I get red spots on my skin.
If you use a very hot iron on nylon, it melts.