instruct someone in + subject
Teach a subject or skill
Use in before areas of knowledge or training.
The trainer instructed employees in safety procedures.
Instruct in or by?
Use instruct someone in a subject or skill. By usually introduces a method, not the topic being taught.
Quick answer
Using prepositions with instruct
Instruct in is standard for teaching a subject or skill. By can describe how instruction happens, such as instruct by example.
She instructed us in basic first aid.
The mentor instructs by example.
He was instructed in classical music.
The mentor instructs by example.
He was instructed in classical music.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
instruct someone to + verb
Give formal directions
Use to before an action someone must do.
The judge instructed the jury to ignore the remark.
instruct by + method
Describe the teaching method
By can introduce a means or method of instruction.
She instructs by demonstration.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
instruct by
The coach instructs by example.
Possible when by introduces method.
instruct in
They instructed recruits in navigation.
Standard for subjects and skills.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using by for subjects
Use in for the topic being taught.
✕ She instructed us by mathematics. ✓ She instructed us in mathematics.Missing the object
Instruct usually needs a person or group receiving instruction.
✕ The teacher instructed in science. ✓ The teacher instructed students in science.Quick practice
Choose the expression that matches the intended meaning.
1. The tutor instructed us ___ grammar.
2. The officer instructed the drivers ___ stop.
3. She teaches effectively and instructs ___ example.
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Frequently asked questions
Do we say instruct in or instruct on?
In is the standard pattern for subjects and skills.
Can instruct by be correct?
Yes, when describing a method, such as instruct by demonstration.
What follows instruct when giving orders?
Use an object plus to + verb, such as instruct staff to wait.
Related preposition guides
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