萨拉要是捉住她，会狠狠揍她一顿的。用英语怎么说？

萨拉要是捉住她，会狠狠揍她一顿的。

If Sarah caught her, she would get a thrashing.

if

conj. 如果，倘若，即使，〈口〉是否，假设；n. 条件，设想；

例句
She was old enough to absent herself from the lunch table if she chose...
她长大了，可以自己做主不来吃午餐了。

Sarah

n. 莎拉；

例句
Since he came to live with me, we have been subject to a campaign of spite and revenge which makes Lady Sarah appear angelic by comparison.
自从他来与我同住，我们之间便摩擦不断;相比之下，萨拉夫人倒显得一副菩萨心肠。

caught

v. 赶上( catch的过去式和过去分词 )，接住，引起，看见；

例句
The men were caught in the act of digging up buried explosives.
那些人在挖掘掩埋的爆炸物时被逮个正着。

her

pron. (she的宾格)她，(she的所有格)她的，她，指某个国家，（一艘）船；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

would

aux. 将，将要，愿意，会，打算，大概；v. (will 的过去式，用于转述)将；

例句
I would love to go abroad this year, perhaps to the South of France.
我今年很想出国，可能是去法国南部。

get

vt. 得到，抓住，说服，受到（惩罚等）；vt.& vi. 到达，来；vi. 成为，开始，设法对付，获得利益或财

例句
The regulations were relaxed and the prisoners could get out and about a bit.
规定有所放宽，犯人可以出去短暂放风。

thrashing

n. 打，痛打；v. 鞭打(thrash的现在分词)，彻底击败，打谷，打麦；

例句
Her lawyers have been ruthless in thrashing out a divorce settlement...
她的律师在讨论离婚协议的过程中表现得非常坚决。