ibi factus
I am right here with you
Hereyea
"Venisti" (singular) or "venistis" plural.
''Hic incepit ''pestis.''''
Nemo hic est.
Ibi sum ut maneas.
relinquetur hic ardere
Vellem adesset
The usual way is adsumus, "we are present". It is also possible to say hic sumus, "we are here", though this is considerably less common.
you say helmet in latin (casco)<- in latin
The expression "here you go" is a modern slang term, and there is no equivalent in Latin, which was the language of the Romans. The closest you can come to "here you go" in Latin would be "hic is" if you are speaking to one person and "hic itis" if you are speaking to two or more people.
To say "Who am I?" in Latin you can say "quisnam sum Ego?"