Conditional Sentences with When and Unless
Use when in place of if to talk about general truths. Use the present tense in both clauses.
When you press the button, the washing machine turns off.
When water reaches 100 °C, it boils.
You can use the word unless in place of if in negative sentences.
Unless I study hard, I won’t get top marks.
Unless you exercise, you probably won’t lose weight.
Unless you study harder, you will fail the test.
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