In the source example, understanding Zayd and standing separately remains conception.
“Zayd” — a person's identity.
“Standing” — the concept of being upright.
“Zayd is standing” — an assertion of standing.
“Zayd is not standing” — denial of standing.
The first two present concepts; the latter two express an affirmation or denial of a relation.
Important: hearing a proposition as an example does not mean personally assenting to its truth. Having the form of an assertion does not establish its truth.