Identify the adverb clause in the following sentence:
If you do not hurry, you will miss the boat
A. If you
B. If you do not hurry
C. You will
D. You will miss the boat

Hint: An adverb clause also known as an adverbial clause or dependent clause is a group of words that acts as an adverb in a sentence.

Complete answer:
Adverb clauses are the dependent clauses and they cannot act solely in the sentence. For which, they require subordinating conjunction, like, ‘after’, ‘if’, ‘although’ etc. to connect them with the rest of the sentence. Similarly, an adverb clause will always have a subject and a verb attached to it. Usually, an adverb clause is separated by a comma.
For example: If you do not study, you will fail.
Let us examine the given options to find the correct option.
> If you: The phrase, if you have subordinating conjunction. However, it does not contain a subject and a verb. Hence, this is not the correct option.
> If you do not hurry: The phrase, ‘if you do not hurry’ contains subordinate conjunction, subject, and a verb. Also, it is separated by a comma in the middle of the sentence. Hence, this is the correct option.
> You will: It is not the correct option as it does not contain subordinating conjunction, verb, and a subject.
> You will miss the boat: This is not the correct option as it does not satisfy the above-mentioned rules.

Hence, the correct option is B.

Note:
The Adverb clauses will always provide information about the place, time, frequency, etc. Also, it can be used at the beginning of the sentence, middle, and at the end of the sentence.
For example:
Because he loved her so much, he didn’t believe she was seeing someone else behind his back.
Jack remembered after he left the house, that he forgot his wallet.
I was unaware of love until I met you.