Grunt when ordered somewere:

"Is that were they keep the methane?"
" What choise do I have?"
"Can't I go home instead?" 

Grunt when fellow soldiers get shot:

"It's over... run for your lives"
"I didn't like him anyway"
"Look at me... I'm not full of holes"
 

Grunt after killing a human:

"Methane power!!!"
"Eat plasma you air breathing freaks!!!"
"Can't belive I got one"
"Did anyone else see that?"

Grunt if his methane tank gets destroyed:

"Oh god no.... I need that to live"