题目

1.When ___ the first man made satellite ___(send) up into space?
1.When ___ the first man made satellite ___(send) up into space?
2.She ___(help) him with his homework yesterday.
3.John ___(hear) to go upstairs two hours ago.
4.___ paper ___(make) of wood?

提问时间：2020-10-29

答案

1.When was the first man made satellite sent(send) up into space?(此句用过去时,发射卫星已经发生,所以用过去时）
2.She helped(help) him with his homework yesterday.（此句也用过去时,有过去时间yesterday做标志）
3.John was heared(hear) to go upstairs two hours ago.（此句用被动语态,John是被听到,而且也有过去时间 two hours ago 做标志,所以要用过去时）
4.Is paper made(make) of wood?此句要用被动语态,纸是以木头为材料制成的,纸是被制造.