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.

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英语改被动语态TheysawaUFOflyinginthesky.(改为被动句)AUFO()()()inthesky.英语改被动语态TheysawaUFOflyinginthesky.(改为被动句)A

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.
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.

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
因为被动句的构成是、、be动词 + 过去分词

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