I have never been swimming.句子里swim后面要加的ing是因为be的存在?

分类: 作业答案 • 2021-12-28 18:00:46

问题描述：

答

have been doing是现在完成进行时的结构,表示某个动作从过去持续到现在,否定形式是have not been doing,never比not语气更强烈.