2．误点点拨：①find 改为finding 。此处是现在分词短语作主语。②去掉of , because of不可接句子，只可接名词或名词短语，此句改为：because the entrances and exists are hidden at some corner of the street。

　　3．画龙点睛：To our disappointment, finding the subway in many big cities often takes much time , just because the entrances and exits are hidden at some corner of the street.句虽然用了连接短语，但不够简洁，可改为It often annoys us so much to make great efforts to find the hidden entrances and exits at some unknown corner.

　　【参考范文】

　　Dear Sir/ Madame

　　I am writing this letter for the purpose of making some suggestions for the subway that will be built. For a smoothly-flowing subway I would like to suggest the following.

　　First, more outstanding entrances and exits to subway stations should be provided. It is usual that entrances and exits are hard to find since they are almost hidden at the corner of the street. Besides, directing signs are easily left unnoticed because of many advertisements. Second, it would be better to replace traditional steps with lifts to make it convenient for the elders and even for the disabled．Furthermore，lifts help save time．

　　Looking forward to the improvement of the subway and wishing you all the success．

　　Yours sincerely，

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