他对于我毕业之后的事情已经有些紧张过度了。
杰克从英国回到家时，他的儿子已经大学毕业了。
By the time Jack returned home from England, his son had graduated from college.
他已经开始写毕业论文了。
到那时他就已经毕业了。
大学毕业时，他已经能够说三种外语了。
By the time he graduated from college, he was able to speak three foreign languages.
到我毕业时，他已经教那个班三年了。
By the time I left the school, he had taught the class for 3 years.
到我毕业时，他已经教那个班三年了。
By the time I left the school, he had taught the class for 3 years.
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