happen的過去式例句

　　1.Mechanization happened years ago on the farms of Islay.

　　數年前，艾萊的農場就實現了機械化。

　　2.It happened at Stamford Bridge one murky November afternoon.

　　這發(fā)生在11月一個陰沉的下午，斯坦福德橋上。

　　3.Her son used sign language to tell her what happened.

　　她兒子用手語告訴她發(fā)生了什么事。

　　4.Elaborate efforts were made to reconstruct what had happened.

　　為重現當時的情景，他們做了大量細致的工作。

　　5.An investigation is underway to find out how the disaster happened.

　　調查已經展開，以查明災難是如何發(fā)生的。