My spelling and grammar are excellent. The subject--spelling and grammar--is plural and therefore takes a plural verb. An easy "ear test" is to substitute simpler words. You would say, "It is excellent." You would also say, "They are excellent." Saying "spelling and grammar" is like saying "they" in this context.
That question is very general and demeaning to those who do have decent or excellent grammar. However, most probably would agree that the lack of correct spelling and grammar usage can be a problem on the Internet in general.
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
No. The correct grammar is "would give"
Because it is important to spell correctly and have good grammar. Bad spelling can result in something that does not make sense or means something different than what you intended. It is particularly important for formal documents and things you are creating for other people to read. It would look very bad and unprofessional if you have bad spelling and grammar. It also makes you look careless and that does not create a good impression. If you were applying for a job and had spelling and grammar errors in your letter and CV, a lot of employers would ignore your application. So it is very important to get your spelling and grammar correct.
No, the correct grammar would be "I hate you the way you hate me."
"It would not have fitted" is the correct grammar.
The correct grammar for that sentence would be "I will definitely join this group."
No, "Is was able to confirmed" is not correct grammar. The correct phrase would be "It was able to be confirmed."
No, "hows you" is not correct grammar. The correct way to ask that question would be "How are you?" or "How are you doing?"
No, the correct grammar would be "We moms and our kids."
No, the correct grammar would be: "July has just started."
No, "with regards" is not correct grammar. The correct phrase is "with regard to."