help yourself to something 自己拿某物lost oneself 迷路

seat oneself 就坐dress oneself 穿衣

［误］-　Who's this speaking.-　That's Mary.

［正］-　Who's that speaking.-　This is Mary.

［析］在电话用语中，this指讲话人自己，而that指对方。

［误］The days in summer are longer than this in winter.

［正］The days in summer are longer than those in winter.

［析］在比较句中往往为了避免重复，可以用that或those取代前面提到的事物，如是单数时用that,复数时用those，如：The weather in Beijing is hotter than that in Chang Chun.

［误］It is so a good book that everyone likes to read.

［正］It is such a good book that everyone likes to read.

［正］It is so good a book that everyone likes to read.

［析］在可数名词单数时可用so+形容词+不定冠词+名词+that从句，也可用such+不定冠词+形容词+that从句。在不可数名词或可数名词复数时，只用such, 如：It is such good weather that I want to go swimming. They are such good books that I want to buy them all.在many, much, few, little这4个词前仅能用so,如： She has so much money that she can buy everything she wants.而在so与that之间仅存形容词时，则不能用such,如:She is so sweet that everyone likes her.

［误］I want to buy a same dictionary as yours.

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