1：MY MOM IS 空 空 空（煮饭）
my mom is cooking.
2:they are working同义句
They are at work.
3:he drinks and eats in the canteen。
he doesn't drink and eat in the canteen。
My mom is cooking the meals.
They are at work.
cooking the meal
they are doing their jobs
1. My mom is (doing some cooking).
2. They are working.
= They are at work.
3. 否定句：He (does not drink or eat) in the canteen.
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