用來表示動(dòng)作發(fā)生頻率的詞叫頻度副詞，常見的頻度副詞有 usually / sometimes / always 等，這些詞在程度上有區(qū)別。頻度副詞的頻率范圍可以用以下這個(gè)表來概括：| 頻率 | 確定頻度副詞
| 模糊頻度副詞
|
|---|
100%
| every second | always |
| ▲ | hourly | usually |
| ▲ | daily | normally |
| ▲ | weekly | often |
| ▲ | monthly
| sometimes |
| ▲ | quarterly | occasionally/infrequently/seldom |
| ▲ | yearly | rarely/hardly ever |
0%
| never | never
|
三、用法
● 一般放在實(shí)義動(dòng)詞之前，系動(dòng)詞、第一助動(dòng)詞或情態(tài)動(dòng)詞之后，例如：
We usually go to the movies on Sundays.Bethany always runs late for work in the morning.We seldom see her anymore.系動(dòng)詞、第一助動(dòng)詞或情態(tài)動(dòng)詞之后：This class is always a bore!She was never very friendly.I have rarely seen the sun rise.She will occasionally go for walks alone.
她偶爾會(huì)獨(dú)自去散步。
You can seldom see very far because of the fog.
因?yàn)橛徐F，你看不到很遠(yuǎn)的地方。
如果有兩個(gè)助動(dòng)詞，頻度副詞通常放在第一個(gè)助動(dòng)詞后面。如：I will never be an actor!We have never been invited to one of their parties. 他們聚會(huì)，一次也沒邀請(qǐng)過我們。She must sometimes have wanted to run away. 為了表示強(qiáng)調(diào)，頻度副詞有時(shí)也可位于動(dòng)詞 be 態(tài)動(dòng)詞之前，例如：
I never was fond of his writing.
我從不喜歡他的寫作。
解析：雖然頻度副詞 never 放在 be 動(dòng)詞之前，但實(shí)際上它修飾的還是形容詞 fond.You occasionally are a nit-picker.解析：此句中頻度副詞 occasionally 修飾的是 be 動(dòng)詞。在簡(jiǎn)略答語中，當(dāng)頻度副詞與動(dòng)詞 be、助動(dòng)詞或情態(tài)動(dòng)詞位于句末時(shí)，頻度副詞必須前置，例如：-----------------------------
-----------------------------
— Can you park your car near the shops?● 有些頻度副詞如：usually, sometimes, normally, occasionally, often 和 frequently 還可以放在句首或句尾，而且出現(xiàn)在句首時(shí)，通常但并不總是以逗號(hào)隔開，例如：He travels to Europe frequently.We’ve been there quite often.
我們經(jīng)常去那里。
He comes up to visit sometimes.Usually, the work is boring.Occasionally I have to go and ask the boss for a rise. ● 除非是為了強(qiáng)調(diào)，否則有些頻度副詞如：always, seldom, rarely, hardly ever 和 never 不出現(xiàn)在句首， 但它們也可以出現(xiàn)在一個(gè)句子或是從句的后面，例如：
當(dāng)頻度副詞放在句首表示強(qiáng)調(diào)時(shí)，句子的結(jié)構(gòu)就發(fā)生變化了，變成部分倒裝，例如：Never have I felt so insulted!Rarely does she leave the house unattended.
她很少會(huì)讓房子無人看管。
Seldom has there been such a happy meeting. ● 頻度副詞經(jīng)常用于一般現(xiàn)在時(shí)，用來談?wù)摿?xí)慣、一般情況和時(shí)間表，但它們也可以用于其他時(shí)態(tài)，例如：
一般過去時(shí)：
She often traveled when she lived in Spain.
她住在西班牙時(shí)經(jīng)常旅行。
現(xiàn)在完成時(shí)：
I have never witnessed such a wonder child as he.
我從來沒有見過像他那樣的神童。
2、修飾形容詞，此時(shí)放在系動(dòng)詞之后，例如：I am always late for work.The trains are occasionally late, but they are generally on time.火車偶爾晚點(diǎn)，但基本上是準(zhǔn)時(shí)的。She is often alone, but I don’t think she minds.她經(jīng)常一個(gè)人，但我想她不介意。
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