how can you be so sure? vs how could you be is sure?

The correct phrase is 'how can you be so sure?' as it is the grammatically accurate and commonly used form. The second phrase, 'how could you be is sure?', is incorrect due to the incorrect verb form and the presence of 'is' which doesn't fit in the context.

Last updated: March 31, 2024 • 4288 views

how can you be so sure?

This phrase is correct and commonly used in English.

This phrase is used to question someone's certainty about something. 'Can' is the correct modal verb to use in this context.

Examples:

How can you be so sure that it will rain tomorrow?
How can you be so sure about your decision?
How can you be so sure of the outcome?
How can you be so sure of his intentions?
How can you be so sure of the facts?

Show examples from the web [+]

I hope so, but how can you be so sure?
How can you be so sure?
How can you be so sure? Sheldon?
How can you be so sure? I'm not.
Excuse me, Captain, how can you be so sure?
Excuse me, Captain, how can you be so sure?
Well, how can you be so sure?
Then how can you be so sure?
You think she's being framed, but how can you be so sure?
Tell me, Miss Brawne, how can you be so sure?
How can you be so sure?
How can you be so sure?
How can you be so sure? I just...
How can you be so sure?
How can you be so sure?
And how can you be so sure?
Gershwitz how can you be so sure?
And how can you be so sure?
How can you be so sure?
How can you be so sure?

how could you be is sure?

This phrase is incorrect and not used in English.

Show examples from the web [+]

Sure? - My knowledge of it is profound.
Who can tell for sure? -It's so awful...
You sure? I could order a test...
Are you sure? ...OK.
Are you sure? It's the second round.
Are you sure? Yes, your Holiness.
Sure? Don't you forget the time we live in.
You sure? - Not done checking him.
FAA, are you sure? Positive.
Are you sure? - They are doing like ants.
Are you sure? -Yes.
Are you sure? I swear I just heard Kaylie crying.
Are you sure? I noticed this earlier.
Sure? It's Afzal molasses tobacco infused with peach resin.
Are you sure? Jesus, this is upsetting.
You sure? I got a call for help.
Are you sure? Lavon Hayes will get your bags.
Are you sure? - Yes sir.
Are you sure? - I'm positive.
Are you sure? - I am very sure.

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how can you be so sure? vs how could you be is sure?