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.