Certain participles have come to be used as prepositions.

Examples.

I have heard nothing concerning his death.

Regarding our conversation yesterday, there is one matter in which I cannot agree with you.

Notwithstanding this brave resistance, they were driven out of the fort.

He is a fine player, considering his age.

We are all well, except my elder brother.

He had gone past the shop before he saw where he was. ...