- No one in her class is as intelligent as her.

⇒ She is the most intelligent girl in her class.

⇒ She is more intelligent than anyone else in her class.

- This class is cleaned by her every morning.

⇒ This class is being cleaned by her now.

⇒ This class has been cleaned by her.

⇒ This class was cleaned by her yesterday.

⇒ This class was being cleaned by her at 6.30 yesterday.

⇒ This class will be cleaned by her tomorrow.

⇒ This class is going to be cleaned by her.

- VD về so sánh bằng:

Nobody in my family is as fat as my father
=> My father is fatter than anyone else in my family
=> My father is the fattest in my family

- VD về câu bị động thì hiện tại đơn:

The flowers are watered by my mother every day
=>
1: The past:

The flowers were watered by my mother yesterday
The flowers were being watered by my mother
The flowers had been watered by my mother
The flowers had been being watered by my mother

2: The present:

The flowers are being watered by my mother
The flowers have been watered by my mother
The flowers have been being watered by my mother

3: The future:

The flowers will be watered by my mother
The flowers will be being watered by my mother
The flowers will have been watered by my mother
The flowers will have been being watered by my mother