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

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

　　【动词不定式开头】

　　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.

　　【独立分词短语开头】

　　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.

　　【过渡句开头】

　　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.

　　【同位语开头】

　　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.

　　【副词从句开头】

　　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.

　　【名词从句开头】

　　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.

　　从以上专家介绍的诸多句子开头方法与例句中，我们可以领略到句式变化的多样性。考生们如果能够掌握上述方法，就会发现我们从原来最常用的名词和代词作主语的句式，变为如此多样化的句子开头。与此同时，灵活的运用句子结构实现句型结构的多样化也不再是一件困难的事。