
Phrasal Verbs:

Conditional types 0 & 1:
Conditional type 0: used to express scientific facts or general facts: If+simple present+simple present
If water reaches 0 degree Celsius, it freezes.
If you open a school, you close a prison. (Victor Hugo's “He Who Opens A School Door, Closes A Prison”.
If you heat ice, it melts.
Conditional type 1: used to talk about possible future events and their likely results: If+simple present+ future simple
If it is fine next weekend, we will go on a picnic.
If he doesn't hurry, he will miss the train.
N.B.:Notice here, when we use if...not, we can replace it with unless followed by a positive verb: unless= if...not.
Unless he hurries, he will miss the train.
Unless he studies hard, he will fail his exams.

Conditional type 0: used to express scientific facts or general facts: If+simple present+simple present

Conditional type 1: used to talk about possible future events and their likely results: If+simple present+ future simple
N.B.:Notice here, when we use if...not, we can replace it with unless followed by a positive verb: unless= if...not.
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