`6`. He is fluent in deliving his lecture.

`->` S + be + fluent in + V-ing: thành thạo làm gì

`7`. They were careful when they did their work.

`->` S + be + adj + when + S + V

`8`. He delivers his lecture eloquently.

`->` S + V + adv

`9`. I've given up reading newspaper.

`->` S + give up + V-ing: dừng làm gì 

`10.` I'd rather not to go out tonight.

`->` S + would rather + (not) + to-V: muốn làm gì

6. he is fluent in deliving his lecture

tobe  fluent in+ Ving: thành thục cái gì

7.  They were careful when they did their work

S+ tobe+ N/adj

8. He delivers his lecture eloquently.

S+ V+ adv

adj_ly=> adv

9. Ive given up reading newspaper

give up Ving: từ bỏ làm gì

10. I'd rather not to go out tonight

S'd rather +(not) to V

= S+ prefer +(not)+ to V