99. The preposition مُنذ
Which means "since," is generally used with words that express time concepts such as ساعَة ٌ ، يَومٌ ، اُسبوعٌ ، شهرٌ ، سَنَة ٌ etc.
**ذَهَبَ إلی البَيتِ مُنذ ُ ساعَةٍ.**
He went home since an hour.
It can also be used with verbs and, therefore, changes its semantic/syntactic functions to an adverb of time.
**ما قابَلتـُها مُنذ ُ افتـَرَقنا.**
I have not met her since we separated.