Answer:
<u>These are the most accurate answers I can give, I'm a native spanish speaker</u>
Yo conozco a muchas personas en mi ciudad
<em>(I know many people in my city)</em>
Ella conoce a el secretario
<em>(She knows the secretary (male))</em>
Nosotros ya lo conociamos
<em>(We already knew him)</em>
Yo no sabia que no conocias a esa persona
<em>(I didn't know that you didn't know that person)</em>
Ayer conoci a una nueva amiga
<em>(Yesterday I met a new friend (female))</em>
<u><em>This is an answer I spent time on I hope you appreciate it!</em></u>