被动语态问题比如i pick up some flowers .被动语态时候是主语当做复数么?The flowers a

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被动语态问题
比如i pick up some flowers .被动语态时候是主语当做复数么?The flowers are picked up by me.
第二个问题.I find him cooking.被动语态是he is found cooking.要是原句是i find him cook.怎么改?

1 原句的主语不能随意改动,当然应当是some flowers
2 如果find的宾语是人称代词,后面可能出现的形式有：
find sb.doing sth
find sb.to be
但是没有 find sb.do sth (因为 do不能作宾补),所以i find him cook.是个错句.
如果非要改的话,宾语变主语,动词变be found,主语 + by 放在句尾,其余部分位置不变.
I found him to be a thief.
He was found to be a thief (by me).
供参考.
再问：可是see/watch/hear这类似有这种用法。find sb do发现某人经常做某事。find sb doing发现某人正做某事。
再答： see watch hear feel notice 等等都是感官动词，据我所知，find好像不是感官动词。根据语法习惯，感官动词后的不定式宾补应当省略不定式符号to,但并非什么动词都可以这样用。不知您的 find sb. do来自何处，可否告知，让我也开开眼？

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