John says that you came yesterday.
Ŝi opinias ke estas mono en la sako
,
she thinks that there is money in the bag.
Ni vidas ke neĝas
,
we see that it is snowing.
A clause is a group of words including a verb, which is dependent upon or subordinate to a main verb or sentence, as "—that he came," "—when he went," "—that he is good," etc.
In English the subordinating conjunction may sometimes be omitted, either "I think that he is good," or "I think he is good," being usually permissible. But in Esperanto there is no variation, and the conjunction ke is never omitted.
THE INDEFINITE PERSONAL PRONOUN ONI.