she won't tell the difference vs won't be able to tell the difference

Both phrases are correct, but they are used in slightly different contexts. 'She won't tell the difference' implies that she is not going to notice a distinction, while 'She won't be able to tell the difference' suggests that she lacks the ability to perceive the distinction.

Last updated: March 20, 2024 • 1146 views

This phrase is correct and commonly used in English to indicate that someone will not notice a distinction.

"she won't tell the difference"

This phrase is used to convey that a person is not going to perceive or recognize a difference between two things.

Examples:

She won't tell the difference between the two fabrics.
He won't tell the difference if you change the recipe slightly.

Show examples from the web [+]

Aug 6, 2015 ... ... so they give each other the same haircut and wear the same clothes "she won't tell the difference between us" to start testing her, I suppose.
6 days ago ... KHCast. Toad: Link, go save princess Daisy! Peach: He isn't Luigi tho. Toad: * looks at Link* eh, he's green, she won't tell the difference.
Dec 23, 2013 ... After all, she won't tell the difference anyway!" Exclaimed the hypnotist, as he attempted to shuffle away. "Aren't you forgetting something?

Alternatives:

She won't notice the difference
She won't realize the difference

This phrase is also correct and commonly used in English to indicate that someone lacks the ability to perceive a distinction.

"won't be able to tell the difference"

This phrase is used to convey that a person does not have the capability to recognize or distinguish between two things.

Examples:

She won't be able to tell the difference between the two wines.
He won't be able to tell the difference if you swap the ingredients.

Show examples from the web [+]

Retail giant Lidl claims you won't be able to tell the difference so we put its goods to the test. No doubt they won't be so easy to tell apart, each as mundane as ...
2 days ago ... You won't be able to tell the difference between a lab-grown diamond and a mined diamond. If you go to the legitimate sources, you'll find that ...
Dec 31, 2014 ... Tweet. 0Share. 0Share. You won't be able to tell the difference between this and the meat versions of pulled BBQ! Vegan BBQ Pulled Jackfruit.
... thoughts are bound to increase in frequency and become “realer” and “realer” until I won't be able to tell the difference between what's real and what's false.

Alternatives:

She won't be able to notice the difference
She won't be able to recognize the difference

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she won't tell the difference vs won't be able to tell the difference