efore doing something
before:是介词,后面跟名词,或者是动名词都可以
starting:是start--->starting,动名词形式
例句:He always goes to bed before having a cup of tea.
他通常睡觉前要喝一杯茶.
efore doing something
before:是介词,后面跟名词,或者是动名词都可以
starting:是start--->starting,动名词形式
例句:He always goes to bed before having a cup of tea.
他通常睡觉前要喝一杯茶.