Englishfor English speakers
one
Determinative
—
(ordinal first) The number 1.
We have one nose and one mouth.
one
Noun
—
The number 1.
One is the smallest whole number.
one
Pronoun
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One is a singular pronoun which means "someone" or "people". It is used more often in formal writing.
It is easy to see the difference if one looks closely enough.
alone
Adjective
—
If someone is alone, they are not with other people.
She looked around to make sure that she was alone before opening the desk.
—
If someone is alone, they have no friends or people they know.
He felt very alone in Canada and wanted to go home.
alone
Adverb
—
If you do something alone, you do it without other people.
She went walking alone because she wanted to think.
—
When you talk about something alone, you mean only that thing.
It will take weeks for the planning alone.
We can't open it. The owner alone has the key.