as 用法歸納總結

下面是小編整理的一些關於as 用法總結， 希望讓大家更好地認識as這個單詞，提高英語水平。

　　(一)、As =Since 作"既然"、"由於"解,引導原因狀語從句,常用來表示已爲人們所知或顯而易見的原因或理由。

如: As he’s been ill for ages, I will help him.

As / Since you're not feeling well, you may stay at home.

As he wasn't ready , we went without him

2. 作連詞的用法:

1.作“在-------期間，當----的時候”引導時間狀語從句.注意與when、 while的用法區別。

①下列情形時,只用as, 而不用when或while。

1)用於表示同一個人的兩種動作交替進行,指一邊----一邊. 如:

The girl sings as she goes to school.

He looked behind occasionally as he went forward in theforest.

2)表示兩個同步發生的動作或行?意思是隨着-----的發展.如:

As time went on / by, she became more and more beautiful.

As children get older, they become more and moreinterested in everything.

3)表示兩個短暫行爲或事情幾乎同時發生.如:I watched her as she read the book.

I thought of it just as you opened your mouth.

Just as the flying worm hit her face, she gave a loudcry.

4)接在名詞後面表示某一個年齡段時.如:

As a young man, he was active in sports.

②when作"當……的時候"解,可以指較短的(一點)時間,也可指一段時間。如:When I was at college, I could speak several foreignlanguages. When the clock struck twelve, I had slept for 2hours.

③ while常表示一段較長的時間或一個過程,強調主句謂語動詞與從句謂語動詞同時發生。如:Work while you work. Play while you play.

3. As =in the way that作"像"、"按照……的方式"解,引導方式狀語從句。如:

Do as I told you.

Remember, you must do everything as I do.

4. 用於as--- as或not / so/ as ----as中,前一個as是副詞,後一個as是連詞,引導比較狀語從句。

如:They helped the old as much as possible.

I don't speak English so/ as well as she does.

5. 表示雖然,儘管等,引導讓步狀語從句,常用倒裝語序,模式爲:

adj. /adv. / n.+as +主語+謂語+主句。如: Young as he is, he knows much.

Tired as they were, they walked on.

　　(二)、 as作關係代詞,引導定語從句,表示正如,這一點.如:

He is very careful, as we all know.

As is well-known,Taiwanbelongs toChina.

另外,當先行詞被the same, such等詞修飾時,常用as來引導定語從句。如:

Such a clever girl as she can learn anything quickly.

I was reading the same book as he bought yesterday.

　　(三)、as作介詞的用法.

1.表示好像。如:He dressed as a policeman.

2. 表示作爲當作。如：I found a job as a guide.

3. 當某人是某身份時。如：As a child , she was sent to abroad.

4. as引導的介詞短語大多用作狀語,as譯爲"作爲";少數情況可引起賓語補足語。如:

As a Party member, I'll take the lead in everything. (狀語)

She works as a model. (狀語)

She has me as one of her best friends.(引起賓語補足語)

　　(四)、as作副詞的用法

1 表示與------等同。如：This dress istwice as expensive as that one. 2 像，如等。如：As before, he remained unmoved.

總之，通過以上的分析，我們對as的詞性和用法有了比較全面的理解和把握，才能在實際的運用中做到心中有數，應付裕如。

意爲“和……一樣”，表示同級的比較。使用時要注意第一個as爲副詞，第二個as爲連詞。其基本結構爲：as+ adj./ adv. +as。例如：

(1)This film is as interesting as that one.這部電影和那部電影一樣有趣。

(2)Your pen writes as smoothly as mine.你的鋼筆書寫起來和我的一樣流暢。

其否定式爲not as/so +adj./ adv. +as。例如：

This dictionary is not as/so useful as you think.這本字典不如你想象的那樣有用。

　　總結

…as結構中，要使用形容詞或副詞的原形。

…as結構用於肯定句或否定句，so…as只用於否定句，用來表示“不如……那樣……”。值得注意的是：它表示的內容總是前者不如後者。使用副詞表示“不相等”的句型中，“not as/so…as…”中的not要和助動詞do,does,did等一起放在行爲動詞前，來構成否定句

…as結構中，若出現名詞，一般將名詞放在as…as中間。若有形容詞作定語修飾單數可數名詞，其前的不定冠詞a/an，須放在形容詞之後。

…as結構中如出現表示倍數的詞，應放在as…as結構之前。如：

Our school is four times as large as yours.我們的學校比你們的學校要大四倍。

…as結構後接具體數字時，是表示長、短、高、矮、重、輕等的程度，而不是表示兩者的比較。如：

Some stones weighas much as fifteen tons.有些石頭重達十五噸。