Childrenspending too much time surfing the Internetmay suffer from some psychological illnesses. = Childrenwho spend too much time surfing the Internetmay suffer from some psychological illnesses.

　　4做状语：

　　Having entered the 21stcentury, we are now blessed with more opportunities and confronted with more challenges.

　　Surfing the Internet, we are often annoyed by various advertisements.

　　Serving in the army, women can perform. as well as men do.

　　5做插入语：

　　A常规

　　1 Properly speaking,

　　2 Generally speaking,

　　3B特殊

　　1 Speaking of

　　9 V-ed: Ved由动词加ed构成。Ved一般在写作中可以做定语，状语，和插入语。

　　做定语：

　　A前置

　　Chance favors thepreparedmind.

　　It seems that we have embarked upon anever-acceleratedera.

　　B后置

　　Difficultiesmasteredare opportunities. = Difficultieswhich are masteredare opportunities.

　　Childrenencouraged to study alonecan cultivate their independence and toughness. = Childrenwho are encouraged to study alonecan cultivate their independence and toughness.

　　做状语：

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