decisive in + activity/process
Important role in an action
In focuses on involvement within an event.
He was decisive in securing the deal.
Decisive in or decisive for?
Decisive in means playing an important role in an action or process. Decisive for means determining an outcome or future result.
Quick answer
How do decisive in and decisive for differ?
Use decisive in for participation in events or processes. Use decisive for when something strongly affects a result or future situation.
She was decisive in the negotiations.
The vote was decisive for the final outcome.
The vote was decisive for the final outcome.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
decisive for + result
Determining an outcome
For highlights consequences or importance.
The evidence proved decisive for the case.
decisive in + victory/change
Strong influence inside an event
Common in politics, sport, and business.
Her leadership was decisive in the campaign.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
decisive in
They were decisive in the reform process.
having an important role within something
decisive for
This moment is decisive for our future.
critical to a result or future
decisive about
She is decisive about spending.
able to make decisions quickly
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using decisive for with participation
Use decisive in when describing involvement in an action.
✕ She was decisive for the talks. ✓ She was decisive in the talks.Using decisive in for future consequences
Use decisive for results or outcomes.
✕ The election was decisive in our future. ✓ The election was decisive for our future.Quick practice
Choose the expression that matches the intended meaning.
1. His role was ___ the merger.
2. This year could be ___ the company.
3. Which sentence is correct?
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Frequently asked questions
Can decisive in and decisive for both be correct?
Yes, but the meaning changes depending on whether you focus on participation or result.
Is decisive about different?
Yes. Decisive about means confident in making decisions.
Which preposition is common with outcomes?
For is common when discussing consequences or future results.
Related preposition guides
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