Now that的用法

我们在用now that这一词组时常常出错。它是个从属连词，可以归入because，as,since这一家族，意思和since(既然，由于)接近，但now that必须引出一个新的情况，否则需要由别的词替代。请看下面的例子：
① Now that none of us knows her telephone number, we will have to send someone to deliver the message．
既然咱们谁也不知道她的电话号码，只有找个人去把消息告诉她了。

② Now that he hasn't fully recovered yet，it will not be proper to assign him such a hard job．
既然他身体还没有完全恢复，指派他干这样的难活不适宜。

这两句中用now that不妥，该换成since或as，因为“没人知道她的电话号码”这一事实，过去如此，现在也如此，不是一个新的情况；“他还没完全恢复健康”也不是一个现在才发生的新情况。下面句子的now that都用对了：

① Now that everyone is here let's start work．现在人都齐了，咱们开始干吧。

②Now that We have coverd the whole chapter we may have a discussion next time we meet．

整个一章都看完了，下次见面时就可以是讨论了。“人到齐了”和“整个一章都看完了”都是现在的新情况。

as…as…的用法
 
as…as…意为"和……一样"，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。其基本用法为as+ adj./ adv. +as…。例如：
This film is as interesting as that one (is).这部电影和那部电影一样有趣。
Your pen writes as smoothly as mine (does).你的钢笔书写起来和我的一样流畅。

其否定式为not as/so +adj./ adv. +as…结构。例如：
This dictionary is not as/so useful as you think it is.这部字典不如你想象的那样有用。
I didn"t catch as many as I had expected.我抓到的不如我预想的那么多。

若有修饰成分，如twice, three times, half, a quarter等，则其必须置于第一个as之前，例如：
You are not half as clever as you think you are.你可不象自己想象的那么聪明。
She isn"t going out with a man who is twice as old as she.她不打算和一个比她大一倍的人出去散步。

几个关于as…as…的常见句型：
1. as…as possible/can 尽可能的
Please answer my question as soon as possible. 请尽快回答我的问题。
The detective is searching the man as carefully as he can.那个侦探正在尽可能仔细地搜那个男子的身。

2. as…as usual/before像以前一样……
She looks as pretty as before.她看起来和以前一样漂亮
Though they failed, they still worked as hard as before. 尽管他们失败了，但他们仍像以前一样努力工作。

3. as long as达……之久；和……一样长；只要（引导条件状语从句）
It took us as long as three years to carry out the plan.我们花了长达三年时间才完成这项计划。
This rope is as long as that one.这条绳子和那条一样长。
I will stay with you as long as there is a room free. 要是你有一间空余的房子，我就住在你这里。

4. as far as 远至；就……而论，据……
He walked as far as the railway station yesterday evening.
昨天傍晚，他一直散步到火车站。
As/So far as I know, the library won"t open until eight o"clock.
据我所知，图书馆要到八点钟才开门。

5. as well as 和……一样好；也；既……又……；除……外，还……
She sings as well as she plays.她唱得好，弹得也好。
The child is lively as well as healthy.这孩子既健康又活泼。
Tom, as well as his brothers, enjoys playing football. 汤姆和他的哥哥们都喜欢踢足球。