En la sala familiar hay un televisor
Se puede nadar en este lago.
It is an impersonal sentence because it has no subject. This case is used "<u>se</u>", it is when we want to talk about the subject.
<h3><em><u>MissSpanish</u></em></h3>
<span>Hace tres meses que nosotros sabemos navegar en la Red.</span>
The answer is “No we cierto que”