$4$. If this car was cheap, we would/could buy it
`->`Câu dk loại 2: If + S + Ved/2, S + would/could + V
$5$. If you work hard, you can get a scholarschip for overseas study
`->`Câu đk loại 1: If + S + V(s/es), S + will/can + V
$6$. If it rains heavily, her relatives can't go to the cinema
`->`Câu đk loại 1: If + S + V(s/es), S + will/can + V
$7$. If Mr.Toan was confident enough, he would/could makr a speech in English
`->`Câu dk loại 2: If + S + Ved/2, S + would/could + V
