can I taky my 120 v from the line and ground (in home) instead of taking between line and neutral because neutral and line in most case connected together

 

No! No! No! Definitely NO!

 

This one deserves two votes. No, no, no! Definitely NO!
You are absolutely begging to get killed.

 

A third vote for NO!
It's also a good idea to use one of THESE after your hookup to make sure everything is OK.
ALWAYS TURN OFF THE POWER TO THE LINES THAT YOU ARE WORKING ON.

 

can I taky my 120 v from the line and ground (in home) instead of taking between line and neutral because neutral and line in most case connected together

Absolutely not. Why do you think there are separate neutral and ground wires? It's to protect you if there's a short between an appliance hot wire and its case, which is connected to the ground. If you use the ground to carry current then an accidental interruption in that ground wire will cause everything connected to the ground to suddenly have mains voltage appear on their cases. Definitely a no-no.