What if the child doesn't write carefully and is crooked?

Don't do this. The children are still young. How many words can adults practice now? This has to be done slowly. Don't blow your top in front of the children. This is not good.

You should first find out why the child doesn't write carefully, whether it is because his mind is not on it or because he just can't write well.

If it is the former, it needs a little inducement to write well, and carrots and sticks can be used together.

If he just can't write well, you can buy some dented copybooks. I think that's not bad. Just stick to it for a while.