Which signs need an AGENT marker?

The agent marker is added to a number of verbs to signify a person who performs the action of a verb (for example, teacher, artist, musician). Coincidentally, it is also the sign for person. This sign is often referred to as the -er sign, although it can also mean -ent, -or, -ist, or -an.

1one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.2 this being so, my trip demanded that i leave my name and my identity at home.3 i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.4 with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

Answeri believe he stays in her tomb with her i think this is the right answer