1. i have been there already. 2. i have already been there. 3. i was already there. 4. already i was there. are they all grammatical? which ones are commonly used? do we have to use the present tense or the simple past tense?

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.  

the answer is academic paper

and the second should be college professor