The string of words: "When we look at severe concussions" is which of the following grammatical structures? *
O an adverbial clause
O an independent clause
O a participial phrase
O a noun clause

an independent clause

Explanation:

An independent clause can be defined as a clause that expresses a complete thought while standing alone as a simple sentence and comprises of at least a subject and a verb (predicate)

Hence, the characteristics of an independent clause are;

I. It contains a subject and a verb.

II. It is used to express a complete thought.

III. It can stand alone as a complete sentence.

Therefore, the string of words: "When we look at severe concussions" is an independent clause.

the correct answer would be:  

a. adverb phrase

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