`1.` Cologne is the oldest city in Germany.

`-` Noun + tobe +adj-er / more adj + than S ....

`=>` S + tobe + the + adj-est / most adj + .....

`2.` Our teacher asked what he should do to apply for that job.

`-` Nghi vấn : S + asked/ wanted to know/ wondered + Wh + S + V ( đổi ngôi / lùi thì )

`3.` Because the weather was warm and cool, we go swimming.

`-` Because / Since + MĐ nguyên nhân : bởi vì

`4.` Despite her richness, she is not happy.

`-` Despite / In spite of+ Noun/gerund (Ving) : mặc dù

`5.` Chicago is the third largest city in the U.S.

`-` So sánh nhất ( tính từ ngắn ) : S + V + the + ( số thứ tự )+ adj-est (+ noun/pronoun)

`6.` Please tell me where to meet you tomorrow morning.

`-` Please + V-inf: làm ơn hãy làm gì 

`-` Wh-ques + to V-inf: để mà ....

`7.` It might be a good idea to have a quiet place to study.

`-` It might be a good idea + to V-inf : đó có thể là ý kiến hay khi làm gì....