什么是PRESENT PERFECT CONTINUOUS啊?
什么是PRESENT PERFECT CONTINUOUS啊?
past continuous/present continuous/present perfect continuou
present perfect simple and present perfect continuous
present continuous tense 跟present perfect continuous tense的混
英语问题,求解释present perfect 和 present perfect continuous.
请问present simple,the present continuous,the present perfect这
Present simple,present continuous,present perfect simple,pre
The present perfect of be is contrasted with the continuous
present perfect continuous和present perfect simple的区别与用法
现在完成进行时:The present perfect continuous是这样写的嘛?
future perfect continuous
present perfect