What suffix indicates an adverb?

There isn't a single suffix that *always* indicates an adverb. However, some common suffixes that often signal adverbs are:

* -ly: This is the most common and recognizable adverb suffix. Examples: quickly, happily, slowly.

* -wards: This suffix indicates direction. Examples: backwards, forwards, upwards.

* -wise: This suffix indicates manner or direction. Examples: clockwise, lengthwise, otherwise.

* -ways: This suffix indicates manner. Examples: sideways, always, anyways.

It's important to remember that these are not the only ways to form adverbs. Many adverbs are simply adjectives with the addition of the word "very" (e.g., very happy, very fast). Some adverbs are even single words that don't have suffixes (e.g., now, here, then).

So, while these suffixes are helpful indicators, they don't tell the whole story. The best way to determine if a word is an adverb is to look at its function in the sentence. An adverb modifies a verb, adjective, or another adverb.