Grammar question

AdeExpress said:

Hello teachers,:-D

It's good to rely on you.

I have a question. Here we go: When do I use has/have or there is/there are on the following situations.

She has a car and a house. (or) YES
She have a car and a house. NO
The number of the (grammatical) object is not relevant.
"to have" agrees with "She".
"He and she have a car." Right

She/He/It has a car. (OK) singular
He and she have a car. (Plural subject = They)
They/I/We/You have a car or They have cars. (OK) plural
Yes, but it's not because 'cars' is plural (the object); it's because all of these pronouns take "have".

And also these examples:

There is a couch in my living room. (OK) singular.
There is a couch and a coffee table in my living room. (or)
There are a couch and a coffee table in my living room.
With there is/there are, there is less agreement on what forms are acceptable. (Probably regional differences as well).
To me,
There's three men here to see you.There're three men here to see you.are both acceptable and commonly used.

Could you please tell me the ones that are Ok and the ones that are NOT OK and explain them???:?:


Thank you so much for your time and attention

Have a great week

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