Questions about example sentences with, and the definition and usage of "Someday"

A: Someday: a non-exact day in the the future.
"Someday, I'll go visit the ocean."

Sometime: at some time in the future.
"I'll go to the mall sometime this week."

A: In the context of meaning an undefined day in the future they mean the same thing. One day however can mean it lasts for a single day or that it is one day away.

A: Someday usually refers to the future. "Someday I hope to travel the world."

One day just means a day it can be in the past or future " I visited Mexico one day a few years ago" (also there is a space between one and day )

A: They are both used many different ways, but sometime usually means soon, like "we should go out to dinner together sometime" someday is more long term, like "I want to study hard and become a doctor someday"

A: Someday = an ambiguous day. We usually use it to talk about the future.

"I would like to go to Paris someday."

Sometime = an ambiguous time. We can use it to talk about the future or the past.

"Sometime last week my car broke down."
"Sometime next month I need to see the dentist."

We can use "sometime" to talk about a time within a day.

"I need to renew my bus pass sometime today."
"Sometime this morning your father phoned me."

So,

"I would like to go to Paris sometime" sounds less "in the future" than "I would like to go to Paris someday."

"I would like to go to Paris someday" sounds more wistful.

A: Sam-dey

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