2：Disneglard is loved by people3:Mickey mouse is like by many children4:English is spoken by the Americans5:She is liked by all of us6:A bike is often riden by Liping.1看不懂,好像題目有點(diǎn)問題...1many terrible pollutes the river那些is不用改was嗎t(yī)he river is polluted by many terrible.這句還是怪怪的。不用改was，因為你沒有任何表示過去的時間的詞。最后一句呢最后一句的often表明這個是經(jīng)常發(fā)生的，用一般現(xiàn)在時即可，比如 I oftengo to supermarket.所以不需要過去式。