she's a worker. is she a worker? she isn't a worker.
i can play the piano. can you play the piano? i can't play the piano.
they want to eat some tomatoes. do they want to eat any tomatoes?
they don't want to eat any tomatoes.
gina has a nice watch. does gina have a nice watch? gina doesn't have a watch.
表示动词在此时正在发生或进行就使用进行时态，结构为sb be v-ing sth 其它.
i'm playing baseball. are you playing baseball? i'm not playing baseball.
nancy is writing a letter. is nancy writing a letter? nancy isn't writing a letter.
they're listening to the pop music. are they listening the pop music?
they aren't listening to the pop music.