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Prepositions after verbs

Assist in or assist with?

Assist in usually refers to participation in an activity or process. Assist with commonly refers to helping with a task, object, or practical matter.

Quick answer

How do assist in and assist with differ?

Use assist in for involvement in activities, processes, or fields of work. Use assist with for practical help involving tasks, tools, or specific problems.

She assisted in the investigation.
Can you assist with the paperwork?
Volunteers assisted in organising the event.

Choose the pattern by meaning

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

1
assist in + activity

Helping take part in an activity

In is common with processes, operations, and organised activities.

Several experts assisted in the negotiations.
2
assist with + task

Helping with practical work

With often introduces tasks, items, or specific duties.

He assisted with data entry during the project.
3
assist someone with + object

Helping a person handle something

Use with when referring to an item or practical issue.

The nurse assisted the patient with mobility exercises.
4
assist in + field

Working within a professional area

In can also introduce areas of work or study.

The consultant assisted in product development for six months.

See the difference in context

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

Construction
Example
Meaning
assist in
They assisted in the rescue operation.
Participation in an activity or process.
assist with
She assisted with the equipment setup.
Help with a practical task or item.
assist someone with
He assisted me with my application.
Helping a person manage a task or problem.
assist at
Doctors assisted at the surgery.
At is possible in formal contexts meaning to be present at an event or procedure.

Common mistakes

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

Using with for broad processes

In is usually more natural for organised activities or operations.

✕ She assisted with the investigation. ✓ She assisted in the investigation.

Using in for physical objects

With fits tools, paperwork, or practical items better.

✕ Can you assist in these boxes? ✓ Can you assist with these boxes?

Leaving out the object after with

With should introduce a specific task or thing.

✕ They assisted with during the conference. ✓ They assisted with registration during the conference.

Quick practice

Choose the expression that matches the intended meaning.

1. The team assisted ___ the research project.
2. Can you assist ___ the presentation slides?
3. The volunteer assisted the visitor ___ the online form.

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Frequently asked questions

Can assist in and assist with both be correct?

Sometimes. The choice depends on whether the focus is the activity itself or the practical task involved.

Is assist with more informal?

It is common in both formal and informal English, especially for practical help.

What is the difference between help and assist?

Assist is usually more formal, but both verbs can describe giving help.

abandon, by, abandon, in "abduct by", "abduct in" or "abduct from"? abide by, in, with, to or on? "abolish in" or "abolish by"? "abound in" or "abound with"? "absorb by", "absorb into" or "absorb in"? "accelerate by", "accelerate to" or "accelerate in"? accentuate by, with, in or under? accept by, in, as, for or into? "accommodate in", "accommodate for" or "accommodate to"? "accomplish by" or "accomplish in"? "accord to" or "accord with"?

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