find的過去式和過去分詞怎么寫?

　　例句

　　Many people here cannot find work.

　　這里很多人都找不到工作。

　　Two thousand of France's 4,200 species of flowering plants are found in the park.

　　法國的4,200種開花植物中有2,000種可見于這個公園。

　　They found her walking alone and depressed on the beach.

　　他們碰見她獨自一人神色憂郁地走在海灘上。

　　It's not the first time that you've found yourself in this situation.

　　你陷入這種狀況已經不是第一次了。