a祈使句的否定式可说成Don't be .

a祈使句的否定式可说成Don't be . 祈使句的否定式是什么 造一组以be动词开头的肯定式否定式的祈使句 have to的否定式是不是don't.have.to 为什么must be的否定式是can't be而不是mustn't be Play with your computer.(改为祈使句的否定式) must be的否定式怎么改 造一组以实义动词开头的肯定式否定式的祈使句 否定式中没有动词用not还是don't 英语的几道关于祈使的题目,Let's go to the park.(改为否定式祈使句）：（ ）to the park.还有上面题目上的那题1.Don't talk in class!(同义句改写）：( )in class!2.You mustn't drive a car too fast.(改为否定祈使 there seem to be否定式There_______ too much work to do tomorrow.A.seems not to beB.seems to be notC.don't seem to beD.isn't seem to be否定式不是there doesn't seem to 那这里没有,该选什么? be动词能和助动词连用吗?书上说be quiet 的否定式是 don’t be quiet ,好像没听过助动词和be动词连用的?!还有 请你和你的朋友保持安静 怎么说? will的否定式`` will的否定式 改祈使句否定式Let us go to school!(改成祈使句否定式）快啊,明天要交作业的! must的否定式是musn't还是mustn't some little kids think they don't get enough gifts这个句子的否定式是正确的吗 be going to do的否定式是什么?