(2) If I were to die tomorrow, what would become of my family?
)I to die tomorrow, what would become of my family?
)I known his telephone number, I would have called him up.
(4) IFI had known his telephone number, I would have called him
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t比
(1) If I were a bird, I could fly to you.
)Ia bird, I could fly to you.
(3) If it should rain tomorrow, the game will be put off.
)it rain tomorrow, the game will be put off.
up.