How come i dont know that vs How came i dont know that

The correct phrase is "how come I don't know that?". The verb "come" is used in the present tense in this expression, not in the past tense as in "how came I don't know that". The phrase is commonly used in informal English to express surprise or confusion.

Last updated: March 29, 2024 • 875 views

This phrase is correct and commonly used in informal English.

"How come i dont know that"

This phrase is used to express surprise or confusion about not knowing something. It is an informal way of asking why someone is unaware of a particular fact or information.

Examples:

How come I don't know that? I thought I was up to date with everything.
How come I don't know that? Did you forget to tell me?
How come I don't know that? It's important information.
How come I don't know that? I must have missed the memo.
How come I don't know that? I feel left out.

Show examples from the web [+]

How come I didn't know that Frankie was getting a new place?
Commissioner, how come I don't know that?
How come I'm the crazy one.
Is how come I'm the Pres.
Reading the situation exactly right is how come I'm the pres.
I kept wondering how come I could have passed so easily.
It's how come I can move around.
That's how come I learned to be funny.
Shift. That's how come I'm free.
How come I always see you?
How come I let him get so close?
How come I never noticed that before?
How come I know so much?
I do my best thinking on the bus. That's how come I don't drive.
How come I've never heard of him? 'Cause the air's thin up there, you miss a lot of stuff.
How come I never get a new dryer?
Then how come I stole his favorite employee?
That's how come I know how to do stuff like build fire pits and cook oatmeal for a whole lot of people at once.
That's how come I got Rudy and Debra over there.
How come I don't like her?

This phrase is incorrect. The verb "come" should be in the present tense, not the past tense.

"How came i dont know that"

Show examples from the web [+]

How came Falstaff's sword so hacked?
That diamond on your finger, how came it yours?
You! How came you by this metal construct?
Then how came he here with you?
How came Falstaff's sword so hacked?
How came two mortals to this place?
How came Chaney to shoot a state senator?
How came you by the heirloom of our house?
How came you to divine he would make attempt on the mines at Lucania?
How came you to divine he would make attempt on the mines at Lucania?
How came Chaney to shoot a state senator?
Then the day came I had to make my move.
If she came I was supposed to knock.
No, perhaps when they came I was already sleeping.
When the cops came I took them to free Gloria.
But then the day came I wasn't a child any more.
Just before that evil came I said my peace and I took care of my baby the way I always was meant to do.
If she came I'll kill her.
Everyone knows that Delvians are flora evolved.
Yes, I know that one.

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How come i dont know that vs How came i dont know that