If you press that button, the light(come) on.
It's easier to sleep if(you / not / be) stressed.
The teacher gets angry if(we / not / work) hard.
If(I / go) on a boat, I always feel sick.
His mother gets annoyed if(he / be) late.
If(I / not / know) a word, I look in my dictionary.
They play football if(they / not / have) any homework.
If you freeze water,(it / turn) to ice.