1. She ( looks ) young.
look---looks 三单
2. Why ( do ) the people plant trees?
are----do plant 动词 借助于助动词do
3.Are they ( singing )?
sing---singing be +动词ing
望采纳!祝开心!
1. She ( looks ) young.
look---looks 三单
2. Why ( do ) the people plant trees?
are----do plant 动词 借助于助动词do
3.Are they ( singing )?
sing---singing be +动词ing
望采纳!祝开心!