1.The children don't go to school in the snowy weather. => If .......................... Unless................... 2. He died so young; otherwise, he would be a famous musician by now. => If...................... Unless ............................ 3. You must tell me the whole truth or I won't help you. => If.................... Unless............... 4. The car breaks down so often because you don't take good care of it. => if................. Unless Were I.................. 5. He is very bad-tempered, that's why his wife left him soon after marriage. => If he................ Unless............. 6. Don't tell lies to your boss or you'll be fired at once. => If........................ Unless...................... 7. She got married at such an early age: otherwise, she would be at university now. => Had................. Unless................ If.............

`-` CĐK Loại `1` : Diễn tả hành động có thật ở Hiện tại

`+` If - clause : Thì HTĐ : S + Vs / es

`+` Main - clause : Thì TLĐ : S + will + V

`-` CĐK Loại `2` : Diễn tả hành động không có thật ở Hiện tại

`+` If - clause : Thì QKĐ : S + Ved / V2

`+` Main - clause : Thì TLTQK : S + would + V

`*` “ Were “ đi với tất cả các chủ ngữ trong mệnh đề “ If “

`-` CĐK Loại `3` : Diễn tả hành động không có thật ở Quá khứ

`+` If - clause : Thì QKHT : S + had + VpII

`+` Main - clause : Thì TLHT trong QK : S + would have + VpII

`-` Unless `=` If not 

`-` Đảo ngữ ĐK Loại `1` : 

`+` If - clause : Should + S + V

`+` Main - clause : Thì TLĐ : S + will + V

`-` Đảo ngữ ĐK Loại `2` :

`+` If - clause : Thì QKĐ : Were + S + to V

`+` Main - clause : Thì TLTQK : S + would + V

`-` Đảo ngữ ĐK Loại `3` :

`+` If - clause : Thì QKHT : Had + S + V

`+` Main - clause : Thì TLHT trong QK : S + would + have

`-` ĐK Hỗn hợp loại `3 - 2` :

`+` If - clause : Thì QKHT : S + had + VpII

`+` Main - clause : Thì TLTQK : S + would + V

`-` ĐK Hỗn hợp loại `2 - 3` :

`+` If - clause : Thì QKĐ : S + Ved / V2

`+` Main - clause : Thì TLHT trong QK : S + would have + VpII

`1`.

`-` If the weather weren't snowy , the children would go to school

`-` Unless the weather were snowy , the children would go to school

`2`.

`-` If he hadn't died so young , he would be a famous musician by now

`-` Unless he had died so young , he would be a famous musician by now

`3`.

`-` If you don't tell me the whole truth , I won't help you

`-` Unless you tell me the whole truth , I won't help you

`4`.

`-` If you took good care of the car , it wouldn't break down so often

`-` Unless you didn't take good care of the car , it wouldn't break down so often

`-` Were you to take good car of the car , it wouln't break down so often

`5`.

`-` If he weren't very bad-tempered , his wife wouldn't have left him soon after marriage

`-` Unless he were very bad-tempered , his wife wouldn't have left him soon after marriage

`6`.

`-` If you don't tell lies to your boss , you won't be fired at once

`-` Unless you tell lies to your boss , you won't be fired at once

`7`.

`-` Had she not got married at such an early age , she would be at university now

`-` Unless she hadn't got married at such an early age , she would be at university now

`-` If she hadn't got married at such an early age , she would be at university now

`\text{# TF}`