should
(1)应该
a formal written appraisal should be prepared annually. 每年应该准备一份正式的评价报告。
(2)推测
they should be home by now. 现在他们应该到家了。
(3) should + have + pp 表过去应做但没做的事。含有责备的意思。
this conclusion should have been double-checked. 该结论本应该反复核对。
(4)表愤怒，不满，失望
i am very sorry that he should be so careless. 真遗憾，他竟然这么粗心。
(5)用于让步从句中
he run away lest he should be seen. 他跑开了，以免被看见。
7. will
(1)请求
will you lend me your dictionary? 请你把词典借我好吗?
(2)表意图，决心
i won't let you down. 我不会令你失望。
(3)表推测
that will be the postman at the door. 在门口的一定是邮递员。
(4)自然规律，习惯动作
fish will die out of water. 鱼离开水会死。
water will boil at 100 degrees centigrade. 水在摄氏100度开。