Sappiamo la verità su Marco.

Breakdown of Sappiamo la verità su Marco.

Marco
Marco
su
on, about
sapere
to know
la verità
the truth

Questions & Answers about Sappiamo la verità su Marco.

Why do we use sappiamo here instead of a form of conoscere?
In Italian, there are two common verbs for "to know". Sapere is used for knowing facts, information, or how to do something. Conoscere is used for being familiar with a person, place, or thing. Since "the truth" (la verità) is a piece of factual information, we must use a form of sapere.
Where is the word for "we" (noi) in this sentence?
In Italian, you can almost always leave out the subject pronoun (like io, tu, or noi) because the verb itself changes to tell you who is doing the action. Sappiamo can only mean "we know," so adding noi at the beginning is optional and mostly just used if you want to add special emphasis.
I thought the preposition su meant "on". Why does it mean "about" here?
You are right that su very often means "on" (like a book on a table). However, when talking about a topic of conversation, a piece of information, or a story, su translates to "about" in English. So, la verità su Marco translates to "the truth about Marco."
Is sappiamo an irregular form? It looks a lot like a regular verb ending.
Even though sapere is highly irregular in the present tense (with forms like so, sai, and sanno), the "we" form (sappiamo) actually uses the standard -iamo ending that all Italian verbs use for the noi subject. You just have to remember that it has a double p!

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