The verb "savoir" ('to know/know how to [do something]') is irregular in Le Présent tense:
Je sais nager.I can swim.
Tu le sais?Do you know that?
Il sait compter jusqu'à dix.He knows how to count up to ten.
Nous savons lacer nos chaussures.We know how to tie our shoes.
Vous savez votre leçon?Do you know your lesson?
Ils savent ce que tu penses.They know what you think.
See also : Connaître vs savoir = to know something vs to know how to do
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