Viết lại câu +It is compulsory for us to attend the meeting this weekend We must +It 's a good idea when she tells the truth to her mother She

+ It is compulsory for us to attend the meeting this weekend . 

`->` We must attend the meeting this weekend . 

Giải thích :

It is compulsory for + O (tân ngữ) + to + V + O (vị ngữ) 

= S + must + V + O (vị ngữ) 

+ It's a good idea when she tells the truth to her mother . 

`->` She should tell the truth to her mother . 

Giải thích :

It's a good idea when + S + V + O (vị ngữ) 

= S + should + V + O (vị ngữ)