Linking verbs: Verbs that do not point to an action but join the subject and the subject subject complement in a sentence are known as linking verbs.
They are the main verb in the sentence.
They can be both transitive and intransitive verb.
Ex: Be , look, appear, grow, seem, sound, taste, turn are used as linking verbs.
Sentence: I am a teacher.
I : subject / am - linking verb / a teacher : the subject complement .[ So, am connects the subject of the sentence to the subject complement ]
The window is broken .[ The window: subject / is : linking verb / broken : subject complement ]
So , is connects the subjects of the sentence of the sentence to the subject complement .
Auxiliary verbs: Verb that help others verbs indicate the tense or are used to carry the negation in sentence are called auxiliary verbs.
Examples: Be, do have.
Be can be used as a verb of being as well as auxiliary verb.
1: Lionel messi is a footballer .[ is as a verb of being --- Lionel Messi > footballer]
2:Lionel Messi is playing football. [ is as the auxiliary verb - helping the main verb play in forming the present continuous tense to show the continuity of the action ]
To + noun : to the hotel [ here to is a preposition ]
To + verb 1st form = to go [ here to is infinitive to ]
To +be + verb third form = to be done [ here to is infinitive in passive voice]