cover的形式

cover的形式 cover by和cover with的区别 求cover的用法 相机的 lens cover cover的意思 cover的多重含义? cover的反义词 cover with能用于句首吗使用适当形式填空.——（cover）with green trees and coloerul flowers,the mountain looks very beautiful.同时请大神讲述一下cover with的用法. cover cover cover cover cover cover cover water is covered （covering）about seventy percent of our earth用cover的哪种形式 Peter likes matchbox cover.HE has a large_(collect)用所给单词的适当形式填空 covering them with all the clothes she could find这里的cover为什么要加ing形式呢?