分詞位于句首作狀語時(shí),其邏輯主語都是這個(gè)句子的主語.
例：Finishing his homework,he went out for a walk.
完成作業(yè)后,他出去散步了.
至于“Having +過去分詞+句子,Having been +過去分詞” 的句子,其用法都是相同的,只是強(qiáng)調(diào)的角度不同而已.單獨(dú)用分詞時(shí),只強(qiáng)調(diào)動(dòng)作的完成,不涉及對(duì)“現(xiàn)在”的影響,而用“Having +過去分詞+句子,Having been +過去分詞”時(shí),就必須涉及到“現(xiàn)在”,也就是現(xiàn)在完成時(shí)的基本用法.
例：Having seen the film,he felt very excited.
Having been living in this city for a month,he visited many places of interest.
當(dāng)然,如果是過去分詞（短語）作狀語,則含有被動(dòng)意義.
例：Hit by a car yesterday,he he had to be in hospital.
Watered by my grandmother,the flowers in the garden look more beautiful.