"You are sure of many things, for one who is not very old."

Are you sure you're not talking about calls for a trade war?

"I'm sure for some of the very same reasons that you did."

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It seemed everybody wanted him, and he wasn't sure for what reason.

They weren't sure, for instance, what words to use instead of husband and wife.

But doctors have never really been sure it works for low back pain.

And even then we may not be sure for quite a long time.

She was not sure for a moment what he meant.

If we really knew the thing was there it might be different, but we're not sure enough for that sort of risk.