英语短文改错Liu Ying was born in a workers' family in June 15 ,194

Liu Ying was born in a worker's family on June 15 ,1943.She became a teacher of English in 1965.
She always tried her best to make her lessons interesting.Many of her students had gone to universities.I visited her yesterday.She was reading a newspaper.She told me that she was getting her teaching plans ready.She had been a teacher for 30 years.

Liu Ying was born in a workers' family in June 15 ,1943.She became a teacher of English in 1965.
She always trys her best to make her lessons interesting.Many of her students have gone to univers...

tried ----trys to (一般现在时,固定词组）
have been to ----have gone to （人不在说话现场用后者，在说话现场用前者）
visited to ----visited(拜访某人不加to)
was getting ----had got (过去完成时）
30 years---- for 30 years（for时间与完成时态连用）