Depends on how you use it. "How much candy do you buy each week?" is correct.
The sentence "I should not have eaten that candy" has better grammar compared to "you should of known better." The correct form is "you should have known better," using the modal verb "have" followed by the past participle "known."
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
No, it is correct grammar, not a correct grammar.
"On a train" is correct grammar.
"how much stuff"
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'.
It is, but it is not conventional English syntax or grammar.
No, the correct grammar would be: "July has just started."
Grammar.
Yes, that is correct grammar.
No, the correct grammar would be "I hate you the way you hate me."
No. The correct grammar is "would give"