Yes, 'It will be I' is correct grammar. The verb 'to be' takes a complement, not an object. Hence:
'Which girl is your sister?' 'That is she.' (Not 'That is her.')
'It was they who stole the money.' (Not 'It was them'.)
'Will it be we who cook dinner?' (Not 'Will it be us?')
'Who will make the opening remarks?' 'It will be I.' (Not 'It will be me.')
Having said that, while the above examples are correct grammar, it is much more common in colloquial speech to use the object form of the pronoun (the form shown in brackets above) rather than the complement. To avoid having to make the choice at all, you could recast the sentence. In the above examples, you might end up with:
'Which girl is your sister?' 'That one.'
'They stole the money.'
'Will we cook dinner?'
'Who will make the opening remarks?' 'I will.'
No, the grammar is not correct. The correct way to say it is "You have to have it cleaned."
No, it's not correct grammar. The correct way to say it is: "was able to confirm"
No, it is not proper grammar. The correct phrasing is "you and I."
No, the correct grammar would be "Look at what you got."
Yes, "you were correct" is correct grammar. This sentence is in the past tense and conveys that someone was right about something.
Yes, that is correct grammar.
No, the grammar is not correct. The correct way to say it is "You have to have it cleaned."
This should say, The next stop will be somewhere in Vasayas, then it will be correct grammar. Written as it is it is not on correct grammar.
No, it is not correct
No, it's not correct grammar. The correct way to say it is: "was able to confirm"
No, it is not proper grammar. The correct phrasing is "you and I."
No, the correct grammar would be "Look at what you got."
Yes, "you were correct" is correct grammar. This sentence is in the past tense and conveys that someone was right about something.
Yes
Absolutely.
No, The correct grammar for this sentence would be, "He finished doing his homework."
Yes, it is correct to say out of compliance with. It means out of help with in English grammar.