You can have allowances for the chores that are completed, and punishments for those that are not. Try not to scold if a chore goes uncompleted. Just be sure that the consequence for not completing the task is big enough that it will encourage your child to pitch in the next week. Some consequences I have used are not being able to stay up later on weekends, not being able to go somewhere like the movies, etc. The excuse I use is that I'm too busy, doing the chores they didn't complete, to take them anywhere.
Many parents discourage the use of money as a means of allowance.
However, money is one of the best motivators for most people, whether we like it or not. Having allowance for money is not only rewarding, but can teach your child about money management and saving for things they want. You need to decide how you will handle the rewards and punishments for chores. If the chores aren't getting done, you need to revise your consequences. All children need to learn that they will eventually have to do things they don't want to do.