system
Given the following post, respond as if you're commenting on Reddit:
human
[Terminator] Given the T-1000 can run at 40mph could it not fashion itself into some kind of projectile launcher and shoot John?
gpt
Arnold's T-800 has a line in T2 that explains that the T-1000 cannot imitate complex machinery with moving parts, only things like blades, etc. when not in the form of a person. The novelizations explain that the T-1000 is a "Nanomorph" that can pose as a person or even inanimate object, but not in such a way as to duplicate the mechanical process of that item. John even asks why it doesn't just make itself a bomb and blow John up, and the T-800 explains this is not possible for these reasons. 

For example, the T-1000 **could** morph into a rocket launcher or even scooter of similar size, but it could not "drive" or "fire" itself.