如： 1)―Must I finish my homework before eight o'clock? ―Yes, you must. 2)―Must I attend the meeting? ―No, you needn't(No, you don't have to). You can askTomto go instead. 3)―May I watch TV after supper? ―Yes, you may. / No, you mustn't. 4)―May I stop here? ―No, you mustn't. 5)―Need we stay behind after school? ―Yes, you must. 6)―Need he go now? ―No, he needn't. 表达必须,一定的.意思的一般现在时的句子中只能用must（需要注意的是：除了现在一般时,其他各种时态都要借用have to） 上一篇：abac式的四字词语有哪些些 下一篇：周期函数怎么判断 |