thousands of English words/several thousand English words

English words 把But,where is the new word in thousands of English words?How 是several thousand还是several thousands of ? several thousand还是several thousands of We've learned over two thousand English words so far,I ( )(learn) about two thousand English words. They______（learn）about two thousand English words since they They about to thousand English words so far用 we have learned two thousand English words 的被动句 有没有many thousand,several thousand,和several thousands of What is the classification of English words? The meanings of some English words