be 小帮手会跟着主语变身。单数配 is / was，复数配 are / were。
规则：先看主语，再选 be。例句：Mary is happy. / The children are playing. / My father was tired.
主语选 be 游戏
答对后才会继续下一题。
Mary
现在时选哪个？
Mr. Bean
现在时选哪个？
She
过去时选哪个？
many students
现在时选哪个？
Two dogs
过去时选哪个？
our teacher
现在时选哪个？
做完啦！你已经会按主语选 be 了。