A linking verb is a verb which connects a subject to its predicate without expressing an action. A linking verb is used to re-identify or describe its subject.
Alan is a beast.
Alan seems drunk.
But I would say that some linking verbs can be used with "continuous tenses" & other linking verbs can not, but I am not sure.
feel (linking verb) to experience a particular feeling or emotion
Ex: I’m feeling a little better today.
Do you still feel hungry?
So, feel in this meaning can be used with continuous tenses
But I would think this sentence "Do you still feel hungry?" does not make much sense because it uses "simple present tense" which expresses something that happens regularly. Noone would feel hungry regularly.
So, that sentence "you feel hungry" would mean "you always feel hungry".
feel (linking verb) (not used in the progressive tenses): to have a particular physical quality which you become aware of by touching
The water feels warm.
Its skin feels really smooth.
This site says "Speakers sometimes use the Simple Present to express the idea that an action is happening or is not happening now. This can only be done with Non-Continuous Verbs and certain Mixed Verbs."
so, "The water feels warm." could mean "The water is always warm" (simple present expressing things that happen regularly - more or less permanent action)
But "The water feels warm." could mean "The water is warm now" (simple present with non-continuous verb expressing things that is happening now - a temporary action)
look: (linking verb) to seem; to appear
to look pale/happy/tired
That book looks interesting.
appear (linking verb) (not used in the progressive tenses): to give the impression of being or doing something
She didn't appear surprised at all.
seem (to somebody) (to be) something (not used in the progressive tenses): to give the impression of being or doing something (synonym: appear)
You seem happy.
So, we cannot say "you are seeming happy" or "you are appearing happy".
But I am not sure I can say "You are looking good" (sounds right to my ears) or "That book is looking interesting." (doesn't sound right to my ears)
But we can say "The future’s looking good." (source)
So, some verbs has the same meaning but one can be used with "continuous" & the other can not, right?
Ex: "you are looking happy", but "you seem happy".