什么是 imperative sentences

it is imperative that? THE ROMANTIC IMPERATIVE怎么样 imperative,necessary有什么区别? Calling ratification a national security imperative解释一下 英语单词IMPERATIVE的中文意思是什么? 什么是英语歧义句 The following are ambiguous sentences.Can you disam sentences making If...sentences writing sentences Improving Sentences.. sentences是什么意思? make sentences