Type 0: facts (兩邊都present tense)
-If you don’t drink water, you die.
Type 1: 有機會發生 real situation (if-clause: present, 後面future tense)
-If you don’t study hard, you will fail in the exam.
Type 2: 時間框架係現在, unreal,impossible situation (if-clause: simple past, 後面would + verb)
-If I were you, I would not make this decision.
Type 3: 時間框架係過去, unreal situation (if-clause: past perfect, 後面would + have + p.p.)
-If I had eaten that sandwich, I would not have been hungry for the entire evening.
有錯請指正