`1.` The students were told the answers to the questions by the professor.

`->` Bị động thì QKĐ:
S + was/were + P2 + (by O)

`2.` Mr. Lam asked me if I was teaching at a secondary school then.

`->` Câu tường thuật `-` yes/no question:
S + asked sb + if/whether + S + V (lùi thì)

`3.` If you keep fit, you can try mountain climbing.

`->` Điều kiện loại `1:`

If + S + V-(s/es), S + will/can/shall + V-bare

`4.` My best friend hasn't attended my birthday party for three years.

`->` The last time + S + Ved/V2 + was + time + ago

`=` S + have/has not + P2 + for + time

`5.` They fight more bravely than they fought.

`->` So sánh hơn `-` adv dài:
S + V + more + adv + than + ...

`6.` Although he behaves impolitely, everybody still loves him.

`->` Although + clause, clause: mặc dù...nhưng...

`1.` The students were told the answers to the questions by the professor

`@` Bị động QKĐ: `(+)` S +  was/were +  `V_(pp)` +  (by+O)

`2.` Mr. Lan asked me If I was being taught at a Secondary school then.

`@` Câu tường thuật dạng câu hỏi:

HTTD:

S +  asked +  sb +  If/ whether +  S +  was/were +  being +  `V_(pp)` +...

`-` now `->` then 

`-` HTTD `->` QKTD

`3.` If you keep fit, you can try mountain climbing.

`@` Câu điều kiện loại 1:

If +  S +  V(s/es) + O , S +  will/can/... +  V_inf + O

`-` If + HTĐ, TLĐ

`4.` My best friend hasn't attended my birthday for three years.

`@` The last time +  S +  V(ed/v2) +  was +  Time 

`<=>` S +  has/have + not +  `V_(pp)` +  for/since +  time 

`5.` They fight more bravely than they did

`@` S1 +  tobe +  more +  adj + N(s/es) +  than +  S2

`<=>` S1 +  V +  more +  adv +  than  +  S2

`6.` Although he behaves impolitely, everybody stills loves him

`@` Despite / In spite of +  N/V_ing , S + V + O

`<=>` Although/though +  S + V + O , S + V + O

`->` Mặc dù