纠错` ` 帮忙下哈

1. Polly spent much time (in) watching the video plays.
2. Shirley decided to win the first prize in the speech competition.
3. I'm sorry I can't find your dog. Maybe it's not alive.

第一句中 “spend”的用法应该是“spend...on sth.”或“spend...(in) doing sth.”
第二句 第一名应该用“the first prize”表示
第三句 句子里面已经有系动词“is”，所以后面不能跟动词“live”，所以应该用“alive”，表示“活着的”。

1.Polly spent much time WATCHING the video plays
SPEND TIME DOING STH
2.Shirley decided to win THE No.1 prize in the speech competition
序数词前要加the
3.I'm sorry i can't find your dog.Maybe it's not ALIVE
alive 活着,副词，表示状态