改错误】1.She look young.2.Why are the people plant trees?3.Are they sing?
问题描述：
改错误】1.She look young.2.Why are the people plant trees?3.Are they sing?
答
She looks young.
Why are the people planting trees?
Are they singing?
答
1.look-looks
2.are-do
3.sing-singing
答
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
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