they often go to school late.一般疑问句 pick.can.them.up,me please,you,for
jim is playing football now.否定 he asks ben some questions about public signs.现在进行时.that sign means keep off the grass 同义句.they mean different things .一般.he sees some public signs in the park 否定.lt means （Danger!）划线我用（表示） they are watching TV now(用every sunday代替now).lt means NO parking(提问） can I watch TV now?(肯定回答) .does your sister come home now?