@fansy,
fansy wrote:
Quote:From the day I got the loan, I began to pay back 180 yuan, principal plus interest, every half a month.
OR
Quote:From the day I got the loan, I began to pay back 180 yuan, principal plus interest, every two weeks.
You would need to add the word 'every' in the second example.
By the way, your two examples don't have the same meaning, so far as repaying a loan goes. Every two weeks would result in a slightly faster payback than every half a month.