1) 自从他出生以来，他就住在这里了。2) 我们已经住在这里三年了。 What tense is used in the above sentences? He has lived here since he was born.We have lived here for four years.Present perfect tense have/ has + p.p. (past participle)1.Audrey had put all her effort into ballet training before she entered the film industry.2.Audrey had been a model before she became a Hollywood superstar.3.Audery had already won an Oscar for Best Actress when she won the Tony Awards.We use the past perfect tense to talk about an action that happened before another action in the past. The earlier action is expressed in the past perfect tense and the later action is expressed in the simple past tense.The Past perfect tense:过去完成时表示：(1) 在过去某一动作之前已经完成的动作 或存在的状态；(2) 在过去某一时间之前发生的动作或存 在的状态。1. Her grandmother had been ill before 2000.2. I had got everything ready by 11 a.m. yesterday.3. Tommy had finished his work before 10:00 last night.4. They had left the cinema by the time I arrived there.The structure of the past perfect tense: had + p.p (past participle) Which action happened first / earlier?1.Millie ran back to school because she had left her magazine in the classroom.2.Simon left school late because the football game had started late.3.Daniel arrived out of breath--- he had gone to the wrong cinema.4.Amy had lost her purse and had to go to the police station. Which action happened first?1.They had already had breakfast before they arrived at the school.2.I had finished my homework by the time my mother came back home yesterday.3.By the time we got there, the bus had already gone.4.When I got to the classroom, I realized I had left my schoolbag at home.5.He said he had...
