What Does "as to" Mean?
- Grammatical function: "As to" is a compound preposition used primarily for topicalization (introducing a specific subject) or to provide clarification. It functions similarly to "regarding," "concerning," or "about."
- Typical sentence position: It is highly versatile, appearing in initial positions to frame a statement, or medial positions to link a verb/noun to a following clause.
- Register: It is generally formal or journalistic. It is frequently found in legal writing, academic papers, and high-quality reportage.
How to Use It
- Syntactic patterns: It is often followed by a noun phrase ("as to the cost") or an interrogative clause beginning with words like how, why, who, or whether ("as to why he left"). It can also be used in the fixed construction "so as to" followed by an infinitive verb to express purpose.
- Punctuation rules: When starting a sentence with "as to" to introduce a topic, it is usually followed by a comma after the introductory phrase. In the middle of a sentence, commas are rarely used unless the phrase is parenthetical.
- Grammatical flexibility: It is very flexible and can start a sentence to signal a shift in topic. However, it cannot be easily negated (one would use "not as to" only in very specific contrastive structures).
- What sounds unnatural: Using "as to" in very casual conversation can sound overly stiff. Additionally, using it before a simple object where a standard preposition like "of" or "about" fits perfectly can feel wordy.
Real-World Examples
These examples are sourced from as to on Ludwig.guru.
"As to the future, she remains pragmatic." — independent.co.uk
"Theories abound as to why." — nytimes.com
"As to FIFA, he promises administrative reform." — nytimes.com
"So as to prevent pandemonium?" — newyorker.com
"Restriction as to Price." — law.cornell.edu
Examples sourced from https://ludwig.guru/s/as+to
Similar Phrases and Alternatives
Depending on the level of formality or the specific situation, you might want to vary your language.
| Phrase |
Context |
| regarding |
Standard formal alternative for introducing a topic. |
| concerning |
Slightly more formal; focuses on the subject matter at hand. |
| about |
The neutral, everyday equivalent used in informal speech. |
| in order to |
A direct replacement for "so as to" when expressing purpose. |
| with respect to |
Very formal/legalistic; used to isolate a specific point for discussion. |
| as for |
Used specifically at the start of a sentence to switch topics. |
Common Mistakes
- Redundancy with Interrogatives: Learners often use it redundantly before 'whether' or 'why' (e.g., 'I am unsure as to whether...') when the simple preposition or verb alone would suffice. "I am unsure whether" is cleaner and preferred in modern style.
- Confusing with "as of": "As of" refers to time (e.g., "as of Tuesday"), whereas as to refers to a topic.
- Overuse in Simple Sentences: Using as to when a simple "about" would work can make prose feel unnecessarily dense or "stuffy."
Quick-Reference Summary
| Expression |
Function |
Register |
Typical Position |
| as to |
Topicalization / Clarification |
Formal / Journalistic |
Initial or Medial |
FAQs
Can "as to" be used at the beginning of a sentence?
Yes, as to is frequently used in the sentence-initial position to introduce a new topic or provide a transition between ideas. When used this way, it is typically followed by a comma after the introductory phrase to separate the topic from the main clause.
What is the difference between "as to" and "about"?
While both link a statement to a topic, as to is significantly more formal and is often used to clarify a specific point of doubt or inquiry. About is the neutral, all-purpose equivalent that is preferred in informal speech and general writing.
Is it always necessary to use "as to" before words like "whether" or "why"?
No, and in many cases, it is considered redundant to include it. While "uncertainty as to whether" is grammatically correct, modern style guides often suggest omitting as to to make the sentence more concise.