13) If Lan wasn't ill, she would join out free planting activity.
( Câu điều kiện loại 2 : quá khứ, tương lai lùi ⇒Form; If+S+was/were+Ved, S+would/could+V)
14) If..........., there would be less pollution.
15)If............, They wouldn't dump waste into the lake.
16) If............., What would happen.
17)If you were be the president,............
18).......................IF they exercised more , they would be heathier
19) If I were had one milion US dollar, .............
20) ...........................If Quan tided his room every day , his mother wouldn't be so upset.
(Mình chỉ làm được vậy thôi , xin lỗi nah)
