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Preposition after adjective

alone in or alone with?

Alone in and alone with are both correct, but they express different meanings.

Quick answer

Different meanings of alone in and alone with

Use alone in for being by yourself in a place or unique in an opinion or quality. Use alone with for being together privately with another person or thing.

She was alone in the office.
He is not alone in thinking that.
I don't want to be alone with him.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
alone in + place

Being by yourself somewhere

Use alone in before rooms, buildings, cities, or other places.

She felt nervous alone in the house.
He was alone in the classroom after school.
2
alone in + opinion or experience

Being unique or unsupported

Alone in can mean not shared by others.

You are not alone in your concerns.
She stood alone in her opposition.
3
alone with + person

Being privately together

Use alone with when only two people or parties are together.

The child was alone with the babysitter.
I need a moment alone with my thoughts.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
alone in
He was alone in the apartment.
By yourself in a place or unique in a situation.
alone with
She was alone with her manager.
Privately together with someone or something.
alone by
She sat alone by the window.
By is a place adjunct, not a fixed pattern after alone.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using alone with for places

Use alone in before places.

✕ He was alone with the room. ✓ He was alone in the room.

Using alone in for private company

Use alone with before people.

✕ She was alone in her brother. ✓ She was alone with her brother.

Confusing unique meaning

Alone in can mean unique or unsupported.

✕ I am alone with this opinion. ✓ I am alone in this opinion.

Quick practice

Choose the expression that matches the intended meaning.

1. She was alone ___ the kitchen.
2. I don't like being alone ___ strangers.
3. You are not alone ___ feeling tired.

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Frequently asked questions

Can alone in describe opinions?

Yes. It can mean unique or unsupported, as in alone in believing that.

Is alone with always about people?

Usually, but it can also refer to thoughts, emotions, or responsibilities.

Can I say alone at home?

Yes. At home is a place expression, separate from the adjective alone.

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