What is Adverbial?

Adverbial is a word or group of words which is used as an adverb in a sentence. Look at the examples below:
 • Bora runs fast. ('fast' is an adverbial)
 • She sings very well. ('very well' is an adverbial)
 • We are sitting in the class. ('in the class' is an adverbial)

WHAT CAN BE AN ADVERBIAL?

[1] An adverb

 • I get up early.
 • He has gone home.
 • We will meet tomorrow.
 • He drives carefully.

[2] An adverb phrase

 • They work very hard.
 • She came a bit late.
 • They lived very far.
 • He acted so carelessly.

[3] A prepositional phrase used as an adverb

 • They are at a hotel.
 • I’m going to the bank. 
 • He wrote with red pen.
 • We will talk after lunch time.