15 Unless you leave me alone, I’ll call the police.
-> Unless đồng nghĩa với : if not
16 Unless you arrive at the office earlier than i do , pls turn on the air condictional
-> Unless đồng nghĩa với : if not
17 if it weren't snowy , the children would go to school
-> câu Đk loại 2
18 had he not died so young , he would be a famous musician by now
-> câu ĐK loại 3
19 Unless you tell me the whole truth, I won’t help you.
-> Cấu trúc: câu mệnh lệnh + or, S will +… = Unless (if not) +…, S won’t +…
