he doesn't understand this word so he look it up in the dictionary -> If ..........

$\color{#006241}{H}$$\color{#007F54}{a}$$\color{#008C5E}{n}$$\color{#00A06B}{a}$$\color{#00AE72}{m}$$\color{#67BF7F}{i}$

` *** ` If he understood this word, he wouldn’t look it up in the dictionary.

` @ ` Câu đk loại ` 2: `

` -> ` If + S + V`2` / V-ed, S + would / could / might + V`1`

` <=> ` Unless + S + V`2` / V-ed, S + would / could / might + V`1`

` - ` Đảo ngữ:

` -> ` Were + S + (not) to V, S + would / could / might + V

` - ` Diễn tả một điều kiện không có thật hoặc khó xảy ra ở hiện tại hoặc tương lai.