過去分詞短語作狀語，可表示時(shí)間，原因，條件等，可發(fā)展為一個(gè)狀語從句。過去分詞作狀語可分為：
一般式 (done) 表示分詞動(dòng)作與謂語動(dòng)作同時(shí)發(fā)生或分詞動(dòng)作發(fā)生于謂語動(dòng)作之前。
完成式 (having been done) 強(qiáng)調(diào)分詞動(dòng)作發(fā)生在謂語動(dòng)作之前。例如：
Scolded (As she was scolded) by the teacher, the girl sat there without lifting her head.
由于被老師批評(píng)了，那個(gè)女孩低著頭坐在那兒。
II．過去分詞作狀語時(shí)的具體用法：
1．過去分詞作時(shí)間狀語相當(dāng)于一個(gè)時(shí)間狀語從句。例如：
Asked (When he was asked) what had happened, he lowered his head.
當(dāng)他被問問題的時(shí)候,他低下了頭。
2．過去分詞作原因狀語相當(dāng)于一個(gè)原因狀語從句。例如：
Frightened (=Because / As she was frightened) by the tiger, the girl didn't dare to sleep alone.
因?yàn)楹ε吕匣? 這個(gè)女孩不敢單獨(dú)睡覺。
3．過去分詞作條件狀語相當(dāng)于一個(gè)條件狀語從句。例如：
Grown (If these seeds are grown) in rich soil, these seeds can grow fast.
如果種在肥沃的土壤里， 這些種子能長(zhǎng)得很快。
Given (If we were given) more time, we could do it better.
如果給我們更多時(shí)間的話，我們可以做得更好。
注意：此句中的given在許多語法書中作為介詞處理。
4．過去分詞作讓步狀語相當(dāng)于一個(gè)讓步狀語從句。例如：
Left (Although he was left) at home, John didn't feel afraid at all.
雖然John被單獨(dú)留在房間里, 他一點(diǎn)都不害怕。
5． 過去分詞作狀語表示伴隨動(dòng)作或狀態(tài)。例如：
The teacher entered the classroom, (and he was) followed by a group of students.
老師進(jìn)入教室，后面跟著一幫學(xué)生。
二. 練一練：
1. ________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A. To wait B. Have waited
C. Having waited D. To have waited
2. ________ by the beauty of nature, the girl from London decided to spend another two days on the farm.
A. Attracting B. Attracted
C. To be attracted D. Having attracted
3. The research is so designed that once ________ nothing can be done to change it.
A. begins B. having begun
C. beginning D. begun
4. ________ to sunlight for too much time will do harm to one's skin.
A. Exposed B. Having exposed
C. Being exposed D. After being exposed
5. Price of daily goods ________ through a computer can be lower than store prices.
A. are bought B. bought
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