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Prepositions after commence

commence in or commence on?

Commence means begin and is often used in formal English. The preposition depends on what follows.

Quick answer

Should I use commence in or commence on?

Use commence on before a project, activity, or topic: commence on construction. Use commence in before a month, year, place, or context: classes commence in September. The verb commence can also appear without a preposition.

Work will commence on the new bridge next week.
The programme will commence in October.
The ceremony commenced at noon.

Choose the pattern by meaning

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

1
commence on + project/activity

Starting work on something

Commence on is used for beginning a task, project, or activity.

They will commence on repairs tomorrow.
2
commence in + time/place

Beginning within a period or location

Commence in introduces a time period, place, or setting.

The course will commence in January.
3
commence with + item

Starting with a particular thing

Commence with introduces the first stage or item.

The meeting will commence with a short presentation.
4
commence + activity

Beginning directly

Commence can take a direct object without a preposition.

The company commenced operations overseas.

See the difference in context

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

Construction
Example
Meaning
commence in
The festival commences in early May.
Used with time periods, places, or contexts.
commence on
Engineers commenced on the tunnel project.
Used for starting work on a project or task.
commence with
We commenced with introductions.
Used for the first step or item.
commence at
The event commences at 7 p.m.
At is used naturally for exact times.

Common mistakes

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

Using commence in before a project

Use on for projects and tasks.

✕ They commenced in the renovation. ✓ They commenced on the renovation.

Using commence on before a month

Use in for months and years.

✕ The term commences on September. ✓ The term commences in September.

Adding an unnecessary preposition

Commence can directly take an object.

✕ The company commenced on operations. ✓ The company commenced operations.

Using commence in very informal contexts

Commence is formal. Begin or start is more common in everyday speech.

✓ The show started late.

Quick practice

Choose the expression that matches the intended meaning.

1. Construction will commence ___ Monday.
2. The semester commences ___ September.
3. The ceremony commenced ___ a welcome speech.

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Frequently asked questions

Is commence on correct?

Yes. It is commonly used for starting work on a project or task.

When do we use commence in?

Use commence in with time periods, places, or contexts such as in June or in London.

Can commence be used without a preposition?

Yes. You can say commence operations or commence negotiations.

calculate, by, calculate, in, calculate, from "call for" or "call on"? "campaign for" or "campaign against"? cancel by, due, at, in or for? capitulate to, in, like, by or after? captivate by, for, with, from or in? "capture by" or "capture in"? "care about" or "care for"? carry with, by, in, to or into? carve into, out, in, on or with? cast in, into, for, by or on? "catch in", "catch by" or "catch on"?

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