know
The word 'sapere' is a verb in Italian that means 'to know'. It is used to express knowledge or understanding of a fact, information, or skill. For example, 'So parlare italiano' means 'I know how to speak Italian'.
I do not know how to swim.
In this sentence, 'sapere' is used in its literal sense to express lack of knowledge or ability in a certain area, in this case, swimming.
You should know that I disagree.
'Sapere' is used here to inform someone else about your state of knowledge or opinion. In this instance, the speaker is informing the listener about their disagreement.
I knew he would arrive late.
This sentence uses the past tense of 'sapere', indicating that the speaker had previous knowledge that the individual would arrive late.