【篇一】
肯定句：动词原型
Come here, please.
Go downstairs, please.
Stand up.
Sit down.
Be quiet.
Be careful.
祈使句中如果有唤语，一定要用逗号隔开，放在句首或者句尾：
Come in, Amy.
Sit down here, Tom.
Mary, give me a book please.
★否定：Don't+动词原型
Don't come here.
Don't sit down.
Don't stand up.
Don't give me it.
let sb. do 让某人做
Let me pass.
Let us have a rest.
Let's have a rest.
反意疑问：
Let's have a walk along the river, shall we?
Let us go out for a drink, will you?
【篇二】
英语名词复数规则
1.一般情况下，直接加-s，如：book-books， bag-bags， cat-cats， bed-beds
2.以s。 x。 sh。 ch结尾，加-es，如：bus-buses， box-boxes， brush-brushes， watch-watches
3.以“辅音字母 y”结尾，变y为i， 再加-es，如：family-families， strawberry-strawberries
4.以“f或fe”结尾，变f或fe为v， 再加-es，如：knife-knives 〕
Leaf--leaves
5.不规则名词复数：
man-men， woman-women， policeman-policemen， policewoman-policewomen，
child-children
foot-feet，。tooth-teeth
fish-fish， people-people， Chinese-Chinese， Japanese-Japanese
【篇三】
引导条件状语从句的从属连词
主要的有if, unless, as [so] long as等：
You can leave now if you like. 如果你愿意现在就可以走了。
As long as it doesn’t rain we can go. 只要不下雨，我们就可以去。
【注】除以上基本的引导条件状语从句的从属连词外，还有的动词尤其是其分词形式(如suppose, supposing, provided, providing等)和介词短语(如in case, on condition that等)也可用作连词表示条件：
In case I forget, please remind me about it. 万一我忘记，请提醒我一下。
I will come on condition (that) she is invited too. 如果邀请她来, 那我就来。
He may go with us provided [providing] he arrives in time. 他若及时到，就可以和我们一起走。
Suppose 和supposing 引导条件状语从句时，通常用于主句为疑问句的场合：
Suppose the boss saw you，what would he say? 如果老板看到你，他会怎样说?
Supposing he does not come, shall we go without him? 他若不来，是不是不带他去?
条件状语从句的时态
当主句为将来时态或具有将来意时，条件状语从句通常要用一般现在时表示将来意义，而不能直接使用将来时态：
I’ll stay at home if it rains tomorrow. 要是明天下雨，我就呆在家里。
【注】有时也可见到 if you will 这样的说法，但那不是将来时态，而是表示意愿或委婉的请求(此处的 will是情态动词)：
If you will wait for a moment, I’ll go and tell the manager that you are here. 请等一下，我去告诉经理说你来了。
