Common Mistakes : Gain

verb

.BAD: For two weeks’ work, I gain about 700,000 yen
.GOOD: For two weeks’ work, I earn about 700,000 yen

.BAD: Without a job it’s impossible to gain any money
.GOOD: Without a job it’s impossible to earn any money

earn or (especially in informal styles) get /make (a sum of) money by going to work, from investments, etc (NOT gain): She earns $4,000 a month