serve as是什么词性?

serve as 是动词词组 担任,充当,起…作用,被用作

例句 John has served his time as a carpenter's apprentice. 约翰给木匠当学徒的期限已满了。

He served as a witness at the wedding. 他在婚礼中当证婚人。

这个一看就是个动词词组。不用怎么判断啊。

同义词有 act as/play as/serve as

serve as后面要加冠词吗

如果是可数名词的单数，肯定要加冠词啦。如：

Old newspapers can serve as a blanket. 旧报纸可以当毯子用。

This stick can serve as a ruler. 这根木棍儿可以当尺子。

serve as主动还是被动

我查了牛津词典,其里面的的例句是：The sofa will serve as a bed for a night or two.可见这是一个用主动语态表示被动力语态的固定用法.这个词就这么用.

“work as”和“serve as”的区别有哪些？

work as多指长期.稳定的职位和工作。

serve as多指暂时.不稳定的工作。

比如:

I served as a temporary worker in a cafe last summer.

serve as monitor为什么不加a

serve as monitor的意思是担任班长。monitor表示班长这个头衔，所以不加a。

serve as的意思是作为, 充当, 担任，用作

monitor表示独一无二的头衔的名词作同位语与宾语补足语时，不加任何冠词，其他情况要加适当的冠词。

用as monitor时（称呼语,头衔的名词做表语,同位语,补足语用零冠词）

如：He acted as monitor in the class

We have named him as monitor.

如果是做状语：As a monitor, he has many duties outside his study.

serve as 有被动吗

由被动。本身serve as可以作主动，表示充当XX作用的意思。同时serve本身有服务，作XX用等几个同个方向的意思，用作被动的时候 be served as 的意思基本你可以直接翻译理解。即 被作为XX提供服务，实际上意思跟 serve as 一样。serve这种的用法大概就是，A serves as B， A is served as B，A serves B as C，A is served by B as C