I want to know firstly if it’s grammatically correct to start a declarative sentence with “Am”. For example:
Am excited about the game today.
Secondly, if it is grammatically incorrect, then I wanted to ask how much “head room” there is for the above usage. I can’t think of an example now, nor find one here at english.stackexchange. However I imagine there are usages of the english language that grammatically are illegal, yet have somehow become accepted as colloquial or idiomatic perhaps.
Some languages are subject-drop languages, but English is considered a subject-obligatory language. The sentence as it stands is non standard. It’s the type of telegraphic language you might see in a text message.