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When I first met her, I didn't know her yet; only later did I find out she was my older brother's classmate.

He has lived in this city for twenty years and knows many people—even the old man who mends shoes on the street corner knows him.

Although I can't read, I understand Mandarin, so it's no problem for me to go out and get things done.

You've just joined the company and don't yet know the rules here, so learn more from your senior colleagues first.

We got to know each other on a trip, and since then we've become good friends.

That scientist is famous worldwide, and his research results are appreciated by many people.