`1.` Not only is he my friend but also yours.

`2.` Not only did he book tickets for the afternoon performance but also the evening performance.

`3.` Not only did the burglars steal a thousand pound's worth of electrical goods but also left the flat in an awful mess.

`4.` Not only was Tony late but he also had left all his books behind.

`5.` Not only will you enhance your posture but also improve your acting ability on this course.

`---------------`

`@`Đảo ngữ `-` No only...but also:
Not only + aux + S + V + but also + clause: không chỉ...mà còn...

`1,` Not only is he my friend but also yours.

`2,` Not only did he book tickets for the afternoon performance but also the evening performance.

`3,` Not only did the burglars steal a thousand pounds'worth of electrical goods but also left the flat in an awful mess.

`4,` Not only was Tony late but also he had left all his books behind.

`5,`  Not only will you enhance your posture but also improve your acting ability on this course. 

`-` `-` `-` `-` `-` `-` `-` 

${\text{Giải thích: }}$

`-` Not only + trợ động từ/tobe + S + V ... : không chỉ..... mà còn .....

                           $\color{pink}{\text{kieuank:3}}$