英语改被动语态They saw a UFO flying in the sky.(改为被动句)A UFO( ) ( ) ( )in the sky.

问题描述:

英语改被动语态
They saw a UFO flying in the sky.(改为被动句)
A UFO( ) ( ) ( )in the sky.

A UFO(was ) (seen ) (flying )in the sky.
sb. see sth. doing sth.
sth. was /were seen dong sth.

A UFO was seen flying in the sky
因为被动句的构成是、、be动词 + 过去分词