1 to goof around 消磨时间

　　e.g. Sometimes I like to goof around, although my parents scold me for that.

　　2 schoolboy error 很基本的错误

　　 e.g. The boy made a schoolboy error on his English test. 这个男生在英语考试犯了个很基本的错误。

　　3 to fall behind with studies =to progress less quickly than others 落后于别人

　　e.g. The girl was ill for a fortnight, so she fell behind with her studies. 这姑娘生病了俩星期了，所以学习上落下了。

　　4 teacher‘s pet =students whom teaachers like the most 老师的宠儿

　　e.g. Some girls are the teacher's pets due to their behaviour over the class. 因为她们上课的表现，有些女生是这个老师的宠儿。

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