We know that adverbs modify verbs, e.g., He ran quickly. (Quickly is the adverb, and ran is the verb.)|
When an adverb consists of more than one word, it is known as an adverbial phrase, e.g., He ran like the wind. If this phrase contains its own verb, it's called an adverbial clause, e.g., He ran like his life depended on it.
Adverbial Clauses and PhrasesQuite often, an adverb in a sentence comprises several words. These types of adverbs are called adverbial phrases or adverbial clauses. Adverbial phrases and clauses (shaded below) can usually be categorised as one of the following:
Adverbs of Time
Adverbs of Place
Adverbs of Manner
Adverbs of Degree
Adverbs of Condition
Adverbs of Concession
Adverbs of Reason
USE A COMMA WHEN IT'S AT THE FRONT
There are very few problems associated with adverbial clauses and phrases. The main grammar point is whether to use a comma or not.
When an adverbial clause or phrase is at the front of a sentence, it is usual to use a comma.