cui meaning in English — that, whom

English meaning

that det Used to point out a specific thing, person, or idea, especially one that is more distant (in space, time, or attention) than something called "this."
whom pron The object form of "who," used when referring to the person a verb or preposition acts on.

cui is used for these senses in English:

that Introducing a clause that is the object of a verb, especially a reporting verb or verb expressing belief, knowledge, perception, etc.
that Introducing a clause that describes the information content of a preceding reporting noun.
whom (interrogative) What person or people; which person or people.
whom As the object of a verb.

det Used to point out a specific thing, person, or idea, especially one that is more distant (in space, time, or attention) than something called "this."
pron Used in place of a noun already mentioned, to refer to it again.
conj Used to introduce a clause explaining or reporting something, often after verbs like "say," "think," or "know."
pron Used to introduce extra information about a noun already mentioned (a relative clause), similar to "which" or "who."
adv To the degree just mentioned; so.

ut ille iste is ista illa istud id qui quod quam quem