Never make these mistakes in Chinese 15

Foreigners often make some strange mistakes in Chinese when they study the most difficult language--- ---Chinese. We try to analyze typical sentences to correct these errors.
       Cóng shàng dàxué de shíhòu yǐ lái, wǒ yì tiān jiǎ yě méiyǒu qǐng guò.
False: 从上大学的时候以来，我一天假也没有请过。
         Cóng shàng dàxué yǐ lái, wǒ yì tiān jiǎ yě méiyǒu qǐng guò./Shàng dàxué de shíhòu , wǒ yì tiān jiǎ yě méiyǒu qǐng guò.
True: 从上大学以来，我一天假也没有请过。/上大学的时候，我一天假也没有请过。

两种表示时间的格式“……的时候”和“……以来”相互杂糅，只能取其中的一种说法。

……的时候 and ……以来 can not occur simultaneously. A choice has to be made between the two patterns.