Yes, it is grammatically correct to begin a sentence with a preposition in certain cases, especially in informal or conversational writing. However, it is generally avoided in formal or academic writing.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Yes, "He sailed his boat on the river" is grammatically correct.
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
No, it is not grammatically correct. The correct way to say it is "your older sister."
I don't understand the question. Perhaps you mean; "Is anyone capable of writing a coherent, intelligible and grammatically-correct question?"
It is what you will hear in informal speech, but is not correct for formal writing. Try: "That is the girl.", "That is the woman.", "That is my sister.", "That is my wife.", etc. The grammatically correct form of the sentence 'That is her' is 'That is she.'
Yes, but it is very informal - that is not suitable for writing.
Yes, it is grammatically correct to begin a sentence with a preposition in certain cases, especially in informal or conversational writing. However, it is generally avoided in formal or academic writing.
Yes, it is grammatically correct; when used, it is followed by a comma. However, it is often overused in writing and shouldn't be used in excess.
"Not like that" can be grammatically correct, depending on the context.
Yes, 'for free', is grammatically correct.
Yes! That is grammatically correct!
"You are" is present tense, happening now,, while "sat" is past tense. so this sentence doesn't work. :" You are sitting writing this," although awkward is correct.
Typically it's not grammatically correct to do so. It depends on the context of what you are writing though.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Whom did you see is correct, and is required in writing. In speech, people generally say "Who did you see?"