The bull rub his horns against that tree.rub可以用过去式吗
问题描述：
The bull rub his horns against that tree.rub可以用过去式吗
答
用现在时rubs和过去时rubbed或者现在进行时is rubbing都可以,主要根据上下文及所要表达的意思确定.
The bull rub his horns against that tree.rub可以用过去式吗
用现在时rubs和过去时rubbed或者现在进行时is rubbing都可以,主要根据上下文及所要表达的意思确定.