Cleft sentences with the reason
Definition
A reason-cleft begins with The reason (why)... and uses a form of be to place the explanation in focus. The focused explanation is commonly a that-clause or a to-infinitive.
Examples
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The reason I left was that I felt ill.
The structure foregrounds the question of why the speaker left.
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The reason why we called was to confirm the date.
A to-infinitive states the purpose behind the call.
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The main reason the plan failed was that nobody checked the figures.
Main identifies the most important cause among possible causes.
Because-clause vs. reason-cleft
I stayed because the roads were icy.
The reason follows the main statement in ordinary clause structure.
The reason I stayed was that the roads were icy.
The sentence makes the reason itself the organizing topic and focus.
The cleft form is useful when contrasting explanations, correcting an assumption or building toward the reason as new information.
Why may be included or omitted
After the reason, the relative word why is often optional. In careful formal style, a finite explanation after be is commonly introduced with that.
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The reason we changed course was that the wind had strengthened.
Why is omitted without changing the core meaning.
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The reason why we changed course was that the wind had strengthened.
Why can be retained when it helps the rhythm or clarity.
Common mistakes
The reason why I called because I needed help.
The reason why I called was that I needed help.
A reason-cleft needs a linking form of be between the opening noun phrase and the focused explanation.
The reason I left was because I was tired.
The reason I left was that I was tired.
In careful formal writing, that avoids repeating the meaning of reason with because.
Quick check
Question 1 of 3
Which sentence is a complete reason-cleft?
The pattern is The reason + clause + be + focused explanation.Which sentence correctly focuses a purpose?
A purpose can be focused with was to + base verb.Which formal version avoids redundant reason marking?
In careful formal style, The reason ... was that ... is the preferred pattern.Nice work — you've completed the quick check.
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