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Prepositions with nouns

In command or of command?

In command means having control or authority. Of command is not usually a complete fixed phrase, but it appears in expressions such as chain of command or tone of command.

Quick answer

Which expression is correct?

Use in command or in command of to describe authority and control. Of command normally follows another noun and does not usually stand alone.

She was in command during the operation.
He is in command of the entire division.
They discussed the chain of command at the meeting.

Choose the pattern by meaning

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

1
in command

Showing authority or control

Use in command when someone has overall responsibility.

An experienced officer was in command.
Who is in command here?
2
in command of + group/place

Naming what is controlled

Use in command of to identify the people, organisation, or area under authority.

She is in command of the rescue team.
He remained in command of the ship.
3
chain/tone of command

Using of command after another noun

Use of command in fixed expressions where another noun comes first.

The military chain of command was clear.
His tone of command annoyed the staff.

See the difference in context

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

Construction
Example
Meaning
in command
The captain is in command.
having authority or control
in command of
She is in command of the project.
controlling a specific thing or group
of command
Of command alone is incomplete in most contexts.
normally part of a larger phrase such as chain of command
command over
He has command over several languages.
skill, mastery, or control

Common mistakes

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

Using of command by itself

Of command usually needs another noun before it.

✕ She is of command of the team. ✓ She is in command of the team.

Omitting of after in command

Use of before the thing being controlled.

✕ He is in command the department. ✓ He is in command of the department.

Confusing command with command over

Command over often refers to mastery or skill rather than leadership.

✕ She has in command the software. ✓ She has command over the software.

Quick practice

Choose the expression that matches the intended meaning.

1. The general was ___ command during the crisis.
2. She is in command ___ the finance team.
3. The company changed its chain ___ command.

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Frequently asked questions

What does in command mean?

It means having authority, leadership, or control in a situation.

Is of command correct?

Usually only as part of a larger phrase, such as chain of command or tone of command.

What is the difference between in command of and command over?

In command of refers to leadership over people or organisations. Command over often refers to skill or mastery.

"in act" or "of act"? "in agreement" or "of agreement"? "in appearance" or "of appearance"? "in area" or "of area"? in, at, on, of or to hand? "in attempt" or "of attempt"? "in battle" or "of battle"? "in celebration", "of celebration" or "for celebration"? "in chain" or "of chain"? "in chapter" or "of chapter"? "in charge" or "of charge"? "in check" or "of check"?

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