Parallelism-Linking verbs

nrxbra001 wrote
The first test whether something is a linking verb or not is to see whether an intended action is involved. Let's take the word 'be'. It denotes a state of being and does not involve any doing on the part of the subject. Any of the derivatives of the verb 'be' is thus also a linking verb. You can check any of the verbs that are listed as linking verbs in google and you can find this feature in all of them.

In contrast, look at some action verbs, 'sing' for example; X sings a song means that X is doing the action of singing. Therefore, it is not a linking verb but an action verb. However, some verbs can be also linking verbs or action verbs, say for example the verb,'appear'
He appeared nervous as he the appeared before the Police -- The first appeared is a linking verb while the second appeared is an action verb
The mango tastes sweet -- a linking verb
Tom tastes a mango---an action verb
That noise sounded terrible --- a linking verb
He sounded his management about his resignation -- an action verb.

This is also true of many such linking cum action verbs such as look, seem, stay, turn, and remain and so on.