1. If it were not for the expense involved, I would go there by air -> Unless 2. If I were you , I would visit her today ->Were

`1.` Unless it were for the expense involved, I would go there by air

`2.` Were I to you, I would visit her today.

`@` Câu điều kiện diễn tả hành động không có thật ở hiện tại .

`=>` Điều kiện loại `2` : If + S + V(quá khứ)/were + O , S + would/modal verbs + V-inf + O .

`-` Biến thể : Unless + S + V(quá khứ)/were + O , S + would/modal verbs + V-inf + O .