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高三复习：高一教材双单元知识点复习unit5-6,
keep(on)doing sth.继续做某事, keep off远离，避开
keep up 保持(不低落)， 振作， （保持同一水平 如：We are having difficulty keeping up our mortgage payments. 我们难以继续偿还按揭贷款。）
keep up with 跟上，不落在后面
6. afford的用法 及物动词，其主要用法如下：
(1)“担负得起(……的费用、时间)”，常与can, could, be able to连用，表示“有足够的(时间、金钱等)条件(做某事)”。
afford +n./pron, . afford to do sth.
Now many people can’t afford the medical treatment in the country. 现在在农村许多人看不起病。
I can’t afford the time for it. 这时间我花不起。
We can’t afford to buy this new house. 我们买不起这新房子。
7. 关系副词when/where不能替代“介词+which”的场合归纳。
在定语从句中，when/where往往可以代替某些“介词+which”。
Tell me the time when/at which the train leaves. 告诉我火车发车的时间。
但在下列情况下，when/where不能代替“介词+which”。
(1)当since, until, after, before+which时，不能被when代替。
I met Jack in 1980, since which I have never seen him. 我是在1980年见过杰克的，自从那时以来再也没见他。
He came back at ten, until which we worked. 他十点钟回来的，直到那时我们还在劳动。
He went to school at 8, before which he read English. 他八点钟上学，这之前他读了英语。
(2)当on, behind, in front of, through, from, beside, around +which时，不能被where代替。
I saw a desk on which was a book. 我看见一张桌子上有本书。
The house, in front of which there is a tree, is my home. 那所房子是我的家，其前有棵树。
This is the window through which the thief came in. 这就是贼从那进来的那个窗户。
8. by sea, by the sea, in the sea, on the sea
by sea “走海路，乘船”，用来表示交通方式，同by ship同义。
These heavy boxes should be sent by sea. 这些重箱子应由海路运送。
by the sea “在海边”，相当于on the coast。
There are many travelers by the sea. 海边有很多游客。
in the sea “在海里，在海水中”
There are many plants and animals in the sea. 海洋中有很多动植物。
(4)on the sea “在海上”，也有“在海边”的意思。
It was reported that many boats sailing on the sea had been lost. 据报道，在海上航行的很多船只失踪了。
9. take off 1)脱下(衣服等), 解(除)掉 2）（飞机）起飞 取消，停演， 迅速流行，突然大受欢迎
the new magazine has really taken off. 这份新杂志真是大受欢迎。
He took off his wet shoes.他脱下了湿鞋子。
The show was taken off because of poor audience. 该剧因为不卖座停演了。
The plane took off on time. It was a smooth take-off.飞机准时起飞。起飞非常顺利。
10. be afraid, be afraid to do sth., be afraid of(doing)sth.
(1)be afraid意为“担心，害怕”，多用于口语，常用来表示一种歉意，或遗憾，后可接so或that，也可接that从句。I’m afraid(that) 其语意相当于I’m sorry, but…。
—Are we on time? 我们准时吗？ —I’m afraid not. 恐怕不准时。
—Are we late? 我们迟到了吗？—I’m
afraid so. 恐怕迟到了。
(2)be afraid to do常表示“由于胆小而不敢做某事”。
She is afraid to be here alone. 她不敢单独呆在这里。
He is afraid to jump into the river from the bridge. 他不敢从桥上跳进河里。
(3)be afraid of(doing)sth.常表示“担心或害怕某事(发生)”。
He was afraid to walk across the one-logged bridge because he was afraid of falling into the river. 他不敢过那个独木桥，因为他担心会掉进河水里。
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，高三复习：高一教材双单元知识点复习unit5-6
