把下列句子改成同义句31 I became a teacher in 2000.32 The river became

更正楼上答案：I后面用has?且时间状语改成since/for...之后,句子的谓语动词必须变成延续性动词.
31.I have been a teacher since 2000.
since引导时间状语,句子必须用延续性动词,而become是瞬间性动词.
32.The river has been dirty since last year.
或：The river has been dirty for a/one year.
33.The shop has been closed for two ours.
或：The shop has been closed since two hours ago.
34.The door has been open since 6 in the morning.
35.I have been up for two hours.
或：I have been up since two hours ago.

I has become a teacher since in the 2000.
The river has come dirty since last year.
The shop has closed since two hours ago.
The door has opened since six in the morning.
I has been up since two hours ago.
希望能够帮到楼主