The structure "so + adjective + as to + infinitive" is a formal, advanced (C2-level) pattern.
It expresses that the degree of a quality is sufficient to produce a particular result or consequence. It is common in academic writing, formal reports, literature, journalism, and legal English.
Structure
Subject + be + so + adjective + as to + infinitive
Formula:
Subject + be + so + adjective + as to + verb (base form)
Meaning
It means:
"The adjective is true to such an extent that it causes the following result."
It is similar to:
so + adjective + that + clause
adjective + enough + to + infinitive
For example:
The evidence was so compelling as to convince everyone. (formal)
The evidence was so compelling that it convinced everyone. (more common)
The evidence was compelling enough to convince everyone. (also common)
Explanation of the examples
The evidence was so compelling as to convince even the most sceptical analysts.
The evidence was extremely convincing, causing even sceptical experts to believe it.
No proposal should be so vague as to create confusion among the delegates.
A proposal should never be unclear enough to confuse people.
His tone was so dismissive as to offend everyone present.
His manner of speaking was rude enough to offend everyone.
The data was so inconclusive as to require a complete reassessment.
The results were uncertain enough that a full review became necessary.
The speech was so eloquent as to silence the entire auditorium.
The speech was so impressive that everyone became silent.
Five new C2-level examples
The discovery was so significant as to alter the course of scientific research for decades.
The discovery was important enough to change future scientific research.
Her argument was so persuasive as to change the minds of even her strongest opponents.
Her reasoning was powerful enough to convince those who disagreed with her.
The contract was so complex as to require months of legal interpretation.
The contract was extremely complicated, making lengthy legal analysis necessary.
The crisis became so severe as to demand immediate international intervention.
The crisis reached such a serious level that help from other countries was required.
His generosity was so remarkable as to inspire countless acts of kindness throughout the community.
He was so generous that many other people were inspired to help others.
Key points
This structure is formal and typical of C2-level English.
It emphasizes the degree of an adjective and its result.
It is often used in academic writing, reports, journalism, literature, and formal speeches.
In everyday conversation, native speakers more often use "so...that..." or "enough to...", while "so...as to..." gives a more sophisticated and formal tone.
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