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<正> 学生容易犯 Before I had not hadmy breakfast,he came to school.这类not多余的典型错误。原因在于中文可以把“在……之前”用于否定句中,表达肯定的意思。如上句可以说:我吃饭之前(还未吃饭),他就到校了。而before这种用法,不能用于否定句中。如: 1.Before he had(≠had not)prepared his lesson,hewent to class.他还没有备课就上课去了。 2.Before I give(≠don’