is covered with 和was covered with的区别

问题描述

精选答案

is covered with 是用什么盖着的意思，而was covered with则是曾经用什么盖着的意思，区别可以从以下例子看出：

These plants was covered with simple plastic, under government regulations, now is covered with special plastic.

其他回答

高中学习天地

前者是一般现在时，后者是一般过去式