"How are your parents?" is the correct way to word it since you are asking about more than one person. If you were asking about only one person, such as the mother, then you would say "How is your mother?".
"How are your parents" is the correct form.
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
Yes.
No, it is correct grammar, not a correct grammar.
The correct grammar is: "Are those correct?"
"On a train" is correct grammar.
The correct grammar for this sentence is: "When did you send it?"
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
No, the correct grammar would be "I hate you the way you hate me."
"July has just been started" is not correct grammar, instead the correct grammar is "July has just started."
The correct way to phrase this question is: "Is my mother and I correct grammar?"
its has he kissed you yet that's the correct grammar-Erendiraa