What an expensive computer it is! (你少打了it)
或How expensive the computer is!
规则： what +主语+ 代词+动词(包含be动词）
How +adj/adv +主语+动词
What a hot day(it is)!=How hot the day is!
What a beautiful shirt you wear (it is)！=How beautiful the shirt you wear is!
2.left hurriedly 匆匆离去
3.How long
4.helpful
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