五.should的用法:
1.表示义务, 责任, 可译为应当
a. We should complete the text in time.
b. You should be so careless.
2.表示推测或推论, 可译为可能, 应该是
a. He should be home by now, I think.
b. He should have arrived in Nanjing by this time.
3.should / ought to的区别:
should / ought to一般可以通用. should侧重于说话人主观上的看法, 有时含有劝告, 建议的口气, 即 按我的想法应该如何 ought to语气更强, 强调有责任, 有义务做某事或者 按道理应该如何
a. I will start the work at once. I think you should start at once.
b. I will start the work tomorrow. No. You ought to start at once.
六.need的用法: need表示需要, 既可作为情态动词, 也可作实义动词
1.need作实义动词时, 注意以下用法:
①.need to do sth; ②.need sb to do sth; ③.need doing sth (主动形式表被动意义)
a. You need to remain in bed.
b. I need you to help me with the housework.
c. The garden needs watering.( =The garden needs to be watered.)
2.need作情态动词时, 多用于否定句及疑问句中, 不用于肯定句中
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