楼上的语法不对.
如果他想杀你,你早就死了：
If he had wanted to kill you,you would have been long dead.
Long dead = dead a long time ago = 早就死了
用 if 【sthing】 had + 过去式动词 （如,wanted） + [名词] + would have + 动词 （如,be）
如果他真那么饿,东西早就被吃光了：
If he had really been hungry,your food would have been long gone.
如果他喜欢你,你不会早就察觉了?
If he had liked you,you would have known long ago.
如果我想回家,我早就回去了：
If I had wanted to go home,I would have gone a long time ago.
自己翻译的,
请及时采纳—— ♥ 多谢 ⌒_⌒