How do we know it's about a human ? With no additional context this sentence seemed impersonal to me so I used 'it'.
According to my knowledge "it" is translated as "ce". If its a masculin human(it sounds wierd to say maculin human) you should use "il" ...the given sentence says "il est très grand" which should be translated as "he is very tall". You dont say "it is very tall" to a human right? Rather you say "it is very big" which is translated to french as " c'est très grand". We us "ce" for the "it" in that sentence.
Thanks very much for your reply and my apologies for not responding sooner, I wasn't receiving notifications from DL earlier this year and have only just seen this. Thanks again.