He acknowledged my presence with a nod.

I always get nervous in her presence.

I can feel Tom's presence.

I didn't want to say anything in Tom's presence.

The screening of donated blood for the presence of various illnesses is expensive, but is also necessary to keep the blood supply as safe as possible.

I could sense Tom's presence.

Tom seemed uneasy in my presence.

Tom seemed uneasy in Mary's presence.

I feel Tom's presence here.