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Conditional 0 / Zero Conditional

Overview | 1st Conditional | 2nd Conditional | 3rd Conditional
The conditional 0 is used to express general truths and facts (often things based on scientific fact).

Uses the simple present tense:-

Formation

(IF Clause)
(Main Clause)
If you heat water to 100°C, it boils.

or...

(Main Clause)
(IF Clause)
Water boils if you heat it to 100°C,

For example:

  • If you drop an apple, it falls. = An apple falls, if you drop it. (This is an absolute truth based on scientific fact - gravity).
  • If you don't do your homework, I will be disappointed. = I will be disappointed, if you don't do your homework. (This is a general truth based on previous knowledge - you know that I am disappointed if people don't do their homework).

Note! Most zero conditional sentences mean the same thing if "when" is used instead of "if".

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