Not having met her, I can't tell you what she's like.

Not having met her, I can't tell you what she's like.

I've worked here for ten years, so I can tell you it's a terrible place to work.

Having worked here for ten years, I can tell you it's a terrible place to work.

They were standing by the side of the swimming pool and they were throwing water at each other.

They were standing by the side of the swimming pool throwing water at each other.

I'm not the sort of person who enjoys large gatherings so I declined the invitation to the party.

Not being the sort of person who enjoys large gatherings, I declined the invitation to the party.

I meet all nationalities in my daily work so I know quite a few words of other languages.

Meeting all nationalities in my daily work, I know quite a few words of other languages.

I've seen his report so I can give you an idea of the situation there.

Having seen his report, I can give you an idea of the situation there.

I've never been to Sydney so I can hardly recommend a hotel there.

Not having been to Sydney, I can hardly recommend a hotel there.