时间不知不觉地过去了 我没有意识到 用英语怎么说

Time gose by but I haven't realized.

你可以说 I didn't realise the time passing by. 或者 Not until I realised it the time passed unconsciously. 用time passed unknowingly也是可以的，但是没有用unconsciously好。

＊一楼的I don't get it. 是“我不明白；我不懂”的意思
＊楼上的几位回答者对pass的过去式／过去分词没有掌握好，pass的过去式／过去分词是passed，而不是past！past本身是一个名词（过去）／形容词（过去的）／副词（过去地）

希望回答对你有帮助。

I've never realized that a time has passed unknowingly .

Time past unconsciously I didn't realize that

the time past without notice.

how time flies! I dont get it!