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If you don't have JavaScript, you can check your answers here:1) If the weather IS nice, we usually go swimming.2) My family will go to the zoo if the weather IS nice tomorrow.3) If I BUY a lottery ticket, I might win the lottery.4) My brother usually drives to school if he HAS gas in his car.5) If it SNOWS tomorrow, we can go skiing.6) My sister will build a snowman if there IS enough snow tomorrow.7) My mom will bake a cake if she HAS enough flour and sugar.8) If there IS milk in the refrigerator, I'll have milk with my cake.9) If my sister EATS all of the cake, I will get angry.10) My mother always punishes my sister if she TELLS a lie.11) If the weather ISN'T nice tomorrow, we can stay home.12) My brother can't drive to school if he DOESN'T GET his car fixed.13) If there ISN'T any milk in the refrigerator, I'll go to the supermarket.14) If it DOESN'T SNOW tomorrow, we can't go skiing.15) My dad will wash his car if it DOESN'T RAIN on Saturday.16) If we DON'T GO to school, my mom will get angry.17) We can't learn anything if we DON'T DO our homework.18) I will call you if she DOESN'T GO to the movies, and we can go out together.19) We should go jogging if it ISN'T raining outside.20) If the phone DOESN'T RING this afternoon, I can take a nap.