I need help regarding the use of has/have/had both as a main verb and as an auxiliary verb.
In the sentence below, the word has acts as the main verb. I would normally follow it with the phrase "so do I."
- Kenny has a car, and so do I.
On the other hand, the word has in the following sentence acts as an auxiliary verb. I would normally follow it with the phrase "so have I."
- Kenny has bought a car, and so have I.
a) Are sentences 1 & 2 above correct? I'm under the impression that so do I is used when has/have/had is the main verb of a sentence, and so have/had I if it's an auxiliary verb in a sentence.
b) Does the verb has/have always need a supporting "auxiliary verb" (either implied or mentioned)? (e.g., Kenny has a car = Kenny does have a car.)