return
因?yàn)榍懊嬗昧爽F(xiàn)在完成時(shí)have been,所以return用一般現(xiàn)在時(shí).have been 后面不是加doing或done的么、課本里常用的一個(gè)表達(dá)方式，Have you ever been to......你有沒有去過什么地方。說去過哪里時(shí)用have been to就行，不用額外加動(dòng)詞?？墒莚eturn是動(dòng)詞、Many people who have been to the park _____（返回）with their friends.很多人去過這個(gè)公園的都是和他們的朋友們一起回來的 who have been to the park 就從句。主干是Many people return with their friends.所以return和who have been to the park是相互獨(dú)立的。