my teacher,Mr Green,()(teach)English for more than 25 years,but he (teach)English for ten more yearsmy teacher,Mr Green,()(teach)English for more than 25 years,but he ()(teach)English for ten more years before he retires

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myteacher,MrGreen,()(teach)Englishformorethan25years,buthe(teach)Englishfortenmoreyearsmyteacher,MrG

my teacher,Mr Green,()(teach)English for more than 25 years,but he (teach)English for ten more yearsmy teacher,Mr Green,()(teach)English for more than 25 years,but he ()(teach)English for ten more years before he retires
my teacher,Mr Green,()(teach)English for more than 25 years,but he (teach)English for ten more years
my teacher,Mr Green,()(teach)English for more than 25 years,but he ()(teach)English for ten more years before he retires

my teacher,Mr Green,()(teach)English for more than 25 years,but he (teach)English for ten more yearsmy teacher,Mr Green,()(teach)English for more than 25 years,but he ()(teach)English for ten more years before he retires
has been teaching (表示从过去到现在一直在教书,而且现在也还在教书)
will teach(将来的事)