如何分conditionals type 0-2?

Type 0: 講科學定理, 自然定律 , 兩面用simple present tense:
If water boils, it turns into steam.

Type 1: 講未來可能會發生既事, 機會未必係100, if 後面用simple present, 另一句用simple future 或 can / may
If he comes, I will go away.
If she comes, I may stay.
if the phone rings, can you answer it?

Type 2: 講假設情況, 冇機會發生既東西, if 後面用simple past, 另一句用would + verb
If I was / were Eason Chan, I would sing many good songs.
If I was / were you, I would do the same.

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