5. 用介词短语开头，表示句子谓语动词发生的时间、地点、方式、原因、条件等：

　　On seeing him approach, the girl immediately turned her face to a shop window

　　pretending to look at something there.( 时间)

　　Around the corner, a crowd gathered.( 地点)

　　Unlike his father, Peter touches neither cigarettes nor alcohol.( 方式)

　　Due to the limit of seats, he was not accepted.( 原因)

　　In case of fire, use the stairways.( 条件)

　　6. 动词不定式开头，强调谓语动词动作的目的：

　　To celebrate the arrival of the Millennium, we held a grand party in the hotel.

　　To show my trust on him, I deposited 10,000 into his bank account.

　　7. 用独立分词短语开头，使句子有正式的味道：

　　Birds singing in the tree, another routine day starts.

　　Sea gulls flying over the water, the old fisherman flung his fishing meat into the open sea.

　　A dog following them, the police searched every suspect.

　　8. 用过渡句开头，表示此句与上下句的关系：

　　Consequently, I slowed down to avoid a fine ticket.

　　In fact, she was a kindhearted woman.

　　9. 用同位语开头，表示主句位于动词发生的时间、地点、原因、方式、条件等：

　　A signing officer of the bank, Jane signs her name hundreds of times each day at work.

　　A TV addict, Jim watches TV movies one after another every evening until after midnight.

　　10. 用副词从句开头，表示主句谓语动词发生的时间、地点、原因、方式、条件等：

　　When you are in need of help, give me a call.

　　Wherever you go, I follow.

　　Since your children love hamburgers and fries, we might as well eat in MacDonald.

　　As if it were summer, everybody wear shorts and a T-shirt.

　　In case that you get lost, call me at this number.

　　11. 用名词从句开头，作整句的主语：

　　Whether you take the position or not makes great difference to me.

　　Why I am unhappy is something I can't explain.

　　What they should do about the hole in the roof is their most pressing problem.

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