Eg：What happened to you?

I happened to see him on my way home. = It happened that I saw him on my way home.

4、Would anyone remain alive? 还有人活着吗?

(1)remain此处作连系动词，意为“一直保持;仍然处于某种状态”，后面可接形容词、名词、动名词ing形式、动词ed形式或介词短语。

Eg：Whatever achievements you’ve made, you should remain modest. 无论你取得多么大的成就，你都该保持谦虚。

【拓展】remain stay 都指“继续停留”或“继续保持某种状态、关系或行动。”remain 常可与stay 互换。

1)表示“继续呆在某处”时，应该用不及物动词remain或stay

Eg：Shall I go or stay?

He remained in his seat after all the other students had gone home.

2)表示“继续保持或处于原来的状态”时，可用remain或stay

Eg： The door stayed closed.

3)表示“暂住、短期停留”时，只能用不及物动词stay

Eg：He is staying at Hilton Hotel.

4)表示“残留、剩下”时，只能用不及物动词remain

Eg：Not much of the house remained after the fire.

5) remain 强调“继续停留于一处或保持原状态、情况性质而不改变”, stay强调“某人[物]继续留在原地而不离开

Eg：This place remains cool all summer.

He stayed to see the end of the game.

(2)alive形容词，意为“活着的，在世的”。

Eg: Is the old man alive now?

【注意】alive和living都可以表示“活着的”，但alive通常作表语或后置定语;而living修饰人或者物时需要前置。

Eg: All living things need air.

5、It covered roads, parks and small houses. 水淹没了道路、公园和小房子。

Cover 此处用作及物动词，意为“覆盖;盖上”，常与介词with搭配。

cover… with … 意为“用……把……盖住”(表示动作)

be covered with... 意为“被……覆盖”(表示状态)

Eg: Please cover the table with a white cloth.

The hills are covered with trees.

【拓展】cover 还可以用作名词，意为“覆盖物;封面等”

Eg：The book needs a new cover.

6、Large objects, such as coaches and boats, passed by my window. 大件的物体，例如汽车和轮船，从窗前经过。

pass by 意为“通过;经过”;还可以表示“(时间)逝去;过去”。