sé

/ˈse/, [ˈse]

be, he, know

Verb sé

First-person singular (yo) present indicative form of saber.

No sé.

I do not know.

Verb sé

Informal second-person singular (tú) affirmative imperative form of ser.

¡Sé un voluntario!

Be a volunteer!

Interjection sé

Examples

No sé si viene George.

I don't know if George is coming.

Source
Sé más cuidadoso en lo que haces.

Be more careful in your actions.

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Sé que estás ocultando algo.

I know you're hiding something.

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Sé que es difícil de ver.

I know it's difficult to see.

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Sé lo que vi.

I know what I saw.

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No sé nada acerca de su pasado.

I don't know anything about his past.

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No sé si es médico.

I don't know if he's a doctor.

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Lo sé bien.

I know it well.

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Por lo que yo sé, no hubo problemas en el primer semestre.

As far as I am aware, there were no problems during the first semester.

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No sé cuánto cuesta esta motocicleta.

I don't know how much this motorcycle is.

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