Sentence examples for you certain this from inspiring English sources

Let's start with a pair of practical concerns: First, are you certain this is the same cat?

"Are you certain this will be worth the journey?" "I am positive, my dear fellow," replied Holmes.

The mayor asked, "Are you certain this is going to save lives?" Not all of Dr. Freiden's efforts to alter New York's food landscape have been successful.

-- Michael Hoke, Washington To cheat a library, that noble institution of democracy, and exploit poor immigrants are indeed unethical acts, but are you certain this is happening?

Never Make Assumptions About Who You Are Talking To Are you certain of this person's position or alliances within the company?

If you get an offer, make sure to take a moment to think about it before accepting, unless you are certain this job is for you.

If you know you have a test at the end of the year, then ask the teacher what you need to do to get the highest grade (or level for you Muggles) and then study all of the time until you are certain this is correct.

How can you be certain this transgression occurred?

Imagine if you had a precise prior that made you certain of $X$ (this is compatible with the above constraints since $X$ was unconstrained).

Are you certain that taking this "shortcut" will be of long-lasting benefits for you?

Remember- if you're certain you don't like this guy, and you only feel bad for him because he's the nice guy that never gets the girl, do not worry.