`\text{Cấu trúc :}`

- CKĐ : `\text{S + be + V-ing}`

- CPĐ : `\text{S + be not + V-ing}`

- CNV : `\text{Be + S + V-ing ?}`

`\text{CKĐ :}`

- I am doing my homework

- She is doing the housework

- He is riding a horse

- They are making cakes

- We are cleaning the playground

`\text{CPĐ :}`

- I am not doing my homework

- She isn't doing the housework

- He isn't riding a horse

- They aren't making cakes

- We aren't cleaning the playground

`\text{CNV :}`

- Are you doing your homework ?

- Is she doing the housework ?

- Is he riding a horse ?

- Are they making cakes ?

- Are you cleaning the playground ?

`\text{@ Fox}`