1
I want to quit my job.
Sign 'I', 'want', 'quit', 'my', 'job'. Emphasize the outward pulling motion of 'quit' to visually show yourself leaving or removing yourself from the workplace situation.
2
Please don't quit now!
Sign 'Please', 'don't', 'quit', 'now'. Pair the sign with a firm, encouraging facial expression and use a sharp, decisive movement for 'quit' to convey the seriousness of the statement.
3
She quit the soccer team.
Point to the person to establish 'She', sign 'quit', then 'soccer' and 'team'. The motion of pulling your hand out perfectly illustrates her removing herself from the group.