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Zero conditional
Form
if + subject + present tense, subject + present tense
if + subject + past tense, subject + past tense
If- (or dependent) clause, main clause
(Condition clause, result clause)
subject + present tense + if + subject + present tense
subject + past tense + if + subject + past tense
main clause + if- (or dependent) clause
(Result clause + condition clause)
if + subject + past tense, subject + past tense
If- (or dependent) clause, main clause
(Condition clause, result clause)
subject + past tense + if + subject + past tense
main clause + if- (or dependent) clause
(Result clause + condition clause)
Zero conditionals refer to situations that are generally true
Conditional sentences that refer to situations that are generally true or were generally true in the past are sometimes called zero conditionals. They always refer to real situations.
If you book in advance, it's usually cheaper.
If I don't get enough sleep, I'm bad tempered all day.
Present tenses are used in both clauses. If I helped with the housework, I got extra pocket money.
If we didn't do our homework, we had to do it in the lunch break.
Past tenses are used in both clauses.
Situations that are generally true now
If I don't get enough sleep, I'm bad tempered all day.
Present tenses are used in both clauses.
Situations that were generally true in the past
If we didn't do our homework, we had to do it in the lunch break.
Past tenses are used in both clauses.
