not…until三种句型now that; due to; because of
not…until有三种句型，即：正常语序、倒装语序和强调句型。
（1）正常语序
The mother didn’t leave the room until the child fell asleep.
I didn’t know the truth of it until the next day.
（2）倒装语序
Not until the child fell asleep did the mother leave the room.
Not until the next day did I know the truth of it.
（3）强调句型 
It was not until the child fell asleep the mother left the room.

It was not until the next day that I knew the truth of it.

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（4）注意事项
①在not…until句型中，主句中的动词均为短暂性动词，如leave,start等。而在until的肯定句型中，主句的谓语动词一定要用延续性动词，因为until作为连词和介词意为up to the time when; up to“直到……时”。如：
②until只连接表示时间的短语和从句，不能用于地点和数量。如：
We walked until the edge of the forest.(误)
Our classroom can hold until fifty students.（误）
from time to time
now and again means  now and then       时而
sometimes
once in a while
at times

now that; due to; because of; owing to; since; as
now that作“既然”讲时，相当于since。now that中的that 可省去。如：Now(that)you are well again, you can travel, 你既然恢复了健康，就能够旅行了。
due to作 “起因于、归功于”时，常作表语或跟在名词后，如：
His failure is due to the fact that he lacks experience.他的失败源于他缺少经验。
Mistakes due to carelessness may have serious results.粗枝大叶造成的错误可能带来严重后果。
The team’s success was largely due to her efforts.该队的成功在很大程度上是由于她的努力。
because of“由于、因为”，在句中作状语或表语。如：
Lincoln is admired because of his good leadership.林肯由于其出色的领导而受到人们的赞赏。
His anger is because of your bad deeds.他是因你的失礼行为而生气。
owing to“由于、因为”，常在现代英语中与because of, due to换用。如：
Owing to unfavourable weather, I was unable to carry on with it.由于天气不好，我不能把它进行下去。
nowhere放在句首，该句应使用倒装结构。
Nowhere is there a place for him to settle down.
类似的副词还有hardly scarcely, no sooner,seldom, never, little等。
Of + n.（抽象句词）相当于该名词相应的形容词，在句中可用作表语或补语。
能用于该句型的名词有：help/ use/ value/ importance等。其对应的形容词分别为：helpful/ useful/ valuable/ important.
①This book is of great use/ very useful.这本书很有用。
②His advice is of great value/ very valuable.他的建议很有价值。
③English is of great importance/ very important to us.英语对我们来说很重要。

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