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As adjectives describe or modify nouns, the adverbs describe or modify verbs, adjectives or other adverbs. The adverb is placed after the verb it modifies. The adverbs are sometimes used to strengthen or weaken the adjectives. Some adverbs or adverbial expressions that tell us about the speaker's viewpoint or opinion about an action,  or make some comment on the action. Of course,  these kinds of adverbs are different from other adverbs because they do not show us how an action took place. They mainly modify entire clauses rather than single verbs, adverbs or adjectives. There is no true distinction between commenting adverbs and  viewpoint adverbs, except in their sentence placement.

There are plenty of adverbs that can be used as viewpoint adverbs can also be used as commenting adverbs. Nevertheless, in some cases, an adverb is far more common as one or the other. The placement of the viewpoint adverb is at the beginning of the sentence. In rare cases, they are placed at the end of it. Usually, they are separated by a comma from the rest of the sentence. Commenting adverbs are  placed before the main verb if not the verb (to be) is used, in which case placement  can be either before or after the verb.

In some cases, commenting adverbs will be  separated with a comma if they are placed before the main verb, despite that in most cases they will not be.  As mentioned, adverbs are used to modify or describe other adverbs to change their degree or persistence. There are also the relative adverbs where, when and why that can be used to join sentences or clauses.