happen的过去式例句
1.Mechanization happened years ago on the farms of Islay.
数年前，艾莱的.农场就实现了机械化。
2.It happened at Stamford Bridge one murky November afternoon.
这发生在11月一个阴沉的下午，斯坦福德桥上。
3.Her son used sign language to tell her what happened.
她儿子用手语告诉她发生了什么事。
4.Elaborate efforts were made to reconstruct what had happened.
为重现当时的情景，他们做了大量细致的工作。
5.An investigation is underway to find out how the disaster happened.
调查已经展开，以查明灾难是如何发生的。