Yes, the sentence "your retina is healthy" is correct.
Of course you can.
To start with ME, not myself.
A correct answer would be yes.
He's bit the apple. This is a correct sentence (don't forget to start a sentence with a capitol letter).
The correct sentence form is: Abby whispered, "The movie is about to start."
The correct punctuation for the sentence "In September you and him get to start going to middle school" would be: "In September, you and he get to start going to middle school."
The correct way to start a sentence with a number is to spell it out... For example... 'Three people were injured' is correct while '3 people were injured' is not.
No, the correct way to start the sentence would be "Robert and I are..." because the pronoun "I" is used as the subject of the sentence. Using "myself" in this context would be incorrect.
You can start a sentence with such as, but it is not considered correct grammar to do so. Try rearranging your sentence so that such as is in the middle.
it IS physically possible, but not grammatically correct.
Yes, but it would not be grammatically correct.