Senses
就是 exactly
to be exactly; precisely; quite right
就是 only
adverb used to limit scope or exclude other possibilities; merely; to be only
就是 [emphasis]
Used to emphasize a point, show determination, or express a strong opinion.
就是 [reassurance]
Used at the end of a sentence to express a request or to reassure someone, often followed by 了 .
就是 even if
Used to express a hypothetical situation, often paired with 也 or 还 in the following clause
就是 but
Used to introduce a turn in thought, meaning "but", "however", or "it is just that".
就是 [agreement]
Used as a standalone response to show agreement with what someone else has said.