请帮忙分析下面这句话的句子成分：How long have you been teaching Chinese at this school?

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• 请帮忙分析下面这句话的句子成分：How long have you been teaching Chinese at this school?
• 请帮忙分析下面这句话的句子成分：How long have you been teaching Chinese at this school?
• According to a recent study,about 80% of British people dream of living in the countryside,
• 句型转换he likes swimming but he doesn't like to swim this afternoon_____he likes swimming ,he doesn't like to swim this afternoon2.she was walking on the street .Suddenly it began to rain heavilyshe was walking on the street _____it began to rain heabily3.close the door,or you'll catch a cold_____ you _____ _____ the door,you'll catch a cold