"Are you still in the marine?"
No, you do not capitalize marine biologist in a sentence. (Unless marine is in the beginning of the sentence)
My luggage is still in the room!
I am still able to write with my right hand.
Yes, it counts as a sentence, as long as you have a noun, subject, or verb.
you use the code "<S> write the sentence here </s>"
After all, they still nee to write commands.
I'm not that those salad greens are still edible.
The water in the pond was still and deep. He heard a still, small voice. The bootleggers used a still to make moonshine.
Even though you are not nice to me but I am still like you my friend?
No matter how many times I did the calculation, the answer still came to 3.100.
This looks like a job for a marine surveyor.
Unknow isn't a word, but "unknown" is. Sentence: The world of aliens is still UNKNOWN to humans.