1、运用两种时态（一般过去时和现在完成时互相转换）
(2) He has been away for one year. (3) He has been away since a year ago.
(4) It is a year since he left.
(5) One year has passed since he left.
(1) He is the tallest student in his class.
(2) He is taller than any other student in his class.
(3) He is taller than the other students in his class.
(4) No one else is taller than him in his class.
I clean my room every day./My room is cleaned every day.
What a careful girl she is!/How careful the girl is!
(1) Amy can’t dance. Susan can’t，either. Neither Amy nor Susan can dance.
(2) I has eaten breakfast and my mother has eaten it，too.
Both my mother and I have eaten breakfast.
(1) I hope that I can visit the moon one day./I hope to visit the moon one day.
(2) He told me how he could use a computer./He told me how to use a computer.
(1) She wants to go shopping and her friends want to go shopping，too./She wants to go shopping，and so do her friends.
(2) He went to bed after he finished his homework./He went to bed after finishing his homework./He didn’t goto bed until he finished his homework.
(3) Come on，or we’ll miss the early bus./If we don’t hurry， we’ll miss the early bus.
(4) The man gave us a talk last week， and he will give us another talk this week./The man who gave us a talk last week will give us another talk this week.
(1) He can finish the work easily./It is easy for him to finish the work.
(2) We found it hard to shake./We found it was hard to skate.