Let's break down the possible meanings:
* Adverbial Clauses: These are clauses that modify verbs, adjectives, or other adverbs. They answer questions like "when?", "where?", "how?", "why?", etc. Examples:
* When the bell rings, we'll leave.
* We'll go where the bus takes us.
* He spoke so softly that I couldn't hear him.
* I ate breakfast because I was hungry.
* Proportion: This usually refers to the relative size or amount of something compared to another thing.
While adverbial clauses can describe the extent or degree of something, they don't directly express a proportion in the mathematical sense.
Perhaps you're looking for:
* Adverbial Clauses of Degree/Extent: These clauses express how much or to what degree something is true. They often use words like *so, too, very, enough, hardly, scarcely, barely*. Examples:
* The water was so cold that I couldn't swim.
* He was too tired to go out.
* Proportional Clauses: While this is not a standard grammatical term, it could refer to clauses that express a relationship of proportion. This could be done through adverbs like *proportionately*, *in proportion to*, etc., or by using comparative structures. Examples:
* In proportion to their size, ants are incredibly strong.
* The more you eat, the less you should exercise.
If you can provide more context or an example sentence, I can help you understand what you're looking for more accurately.