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.