【例句】I am a student.
【例句】The mother patted the baby.
【例句】 He is a worker in that factory.（静态句）
【例句】 He works in that factory.（动态句）
【例句】 The camellias were in bloom. 山茶花正在开放。
【例句】 The old life was at an end.
【例句】 I'm in great trouble.
【例句】 She is in a talkative mood today.
【例句】 Was she ever out of temper?
【例句】 I was under the impression that your sister was a doctor.
【原句】 He described to us his bitter life.
【主语转为表语】 This is he who described to us his bitter life.
【谓语转为表语】 That was his description to us of his bitter life.
【直接宾语转为表语】 Such was his bitter life he described to us.
【间接宾语转为表语】 It was to us that the he described his bitter life.