A1 入门
现在进行时 (Present continuous)
现在进行时表示此刻正在发生的事：Look! It is raining. 结构是 am / is / are + 动词-ing。它也可以表示最近一段时间正在做的事：I am learning English this year.
结构
am / is / are + verb-ing
常见错误
漏掉 am / is / are。
She reading a book.
She is reading a book.
小测验
Be quiet, the baby ______ sleeping.
is · are · am
显示答案
is — the baby 是单数，用 is + sleeping。
They ______ dinner right now.
have · are having · has
显示答案
are having — right now 表示正在发生，用 are + having。
I ______ my homework at the moment.
am doing · do · is doing
显示答案
am doing — at the moment 表示此刻，I 用 am。