English to latin - need help now...!

"You walk with me"
Mecum ambulas

"You're still here with me"
Etiam mecum es

So the first one mecum ambulas, meceum=with me and ambulas= you walk
Ambula is just the verb walk and then when you ad the s it stands for you walk?? The other one what does etiam stands for? Sorry for asking but it's really important to get it right I'm getting a tattoo with this text

Thanks!

Please read this.
Mecum means "with me".
Ambulas is the second person singular present indicative of ambulo.
It means "you walk".
Etiam means "now too", "yet", "as yet", "even yet", "still", or "even now".
You could also use the word adhuc.