He/She is one person and they is plural. It can be awkward sometimes if you have to say 'A student can carry a book if he wants,' when most people tend to put they instead of he because saying he eliminates girls, and 'he or she' is wordy. But the subject is 'a student,' and therefore, 'he' must be used rather than 'they.'
"They" is used as a pronoun for multiple people or things, while "he" is used as a pronoun for a singular male person or thing. Example: "They are going to the store" and "He is working on his homework."
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
The correct grammar is: "Are those correct?"
The correct grammar for this sentence is: "When did you send it?"
No, the correct grammar would be "I hate you the way you hate me."
No, the correct grammar would be: "July has just started."
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.
The correct grammar is: "Are those correct?"
"On a train" is correct grammar.
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: "July has just started."
Grammar.
This will be an exciting month is correct grammar.
The grammar is correct as it is.
No. The correct grammar is "would give"
Yes, that is correct grammar.
No, the correct grammar would be "I hate you the way you hate me."