` 1) ` forcing

It's no good / It's no use ` + V - ` ing

` 2) ` enter

` -> ` observe ` + O + V_0 : ` Complete Action.

--

 ` II> `

` 1) ` She seldom tells lies to me

` -> ` Seldom does she lies to me

Seldom ` + ` be ` + S ` 

` 2) ` The students had hardly left the room when the lights went out.

` -> ` Hardly had the students left the room when the lights went out.

Hardly ` + ` auxiliary ` V + S + ... `

`I.`

`1)` forcing

`→` It's no good + V-ing: Không có ích gì khi làm gì

`2)` entering

`→` observe sb doing sth: quan sát, theo dõi ai làm gì

`II.`

`1)` Seldom does she tell lies to me.

`→` Đảo ngữ: Seldom + aux-V + S + V: Hiếm khi làm gì

`2)` Hardly had the students left the room when the lights went out.

`→` Đảo ngữ: Hardly + had + S1 + V-ed/ 3 + when + S2 + V-ed/ 2: Vừa mới ... thì ...

$@MinhBestEngg$