标签：The ini something start pre unit star res eth
Unit 1 Present continuous (I am doing)
Am/is/are + -ing is the Present continuous.
I am doing something = I‘m in the middle of doing it; I‘ve started doing it and I haven‘t finished.
English Grammar in Use - Part1 Present and past
标签：The ini something start pre unit star res eth
原文地址：https://www.cnblogs.com/ElonJiang/p/11722851.html
