Yes, if punctuated thus: Honestly, Principal! This is a kind of sentence called an exclamation. For example: The exasperated teacher looked up from her desk. But all she said before her eyes returned to her work was "Honestly, Principal!"
No.
This is not a sentence these are two words an adverb (honestly) and a noun (principal).
Adverbs don't go with nouns like this. Adjective plus noun is correct
- honest principal
but still it is not a sentence
"That was wrong" is a grammatically correct sentence.
This sentence is not grammatically correct. For the sentence to be grammatically correct, the space between "in" and "to" would have to be removed. Therefore the sentence should read "They are into skating."
The sentence is grammatically correct.
Yes, it is grammatically correct.
The sentence "Rhoda's Crazy" is not grammatically correct. It is missing a verb to make a complete sentence.
'What a drunkard you are' is a grammatically correct English sentence.
That sentence is grammatically correct.
This sentence is grammatically correct.
This sentence is grammatically correct.
No it should be "You were not there"...
This sentence is grammatically correct.
Short answer : Yes and not impolite at all, as suggested below. This is to be handled by you grammatically correct? requires inverted commas to be correct. It should be written as: "Is this sentence "This is to be handled by you." grammatically correct?" The sentence is correct but not very polite; it would be simpler to say "You are to handle this"