Do it backwards. Do it with your eyes closed. Make a model of it. Write it or how it happens or how it is. Do it again and again until you can do it flawlessly. Explain it to a small child and make them understand it. Try to change it. Make a joke about it. Most important; have some fun with it.

There are a number of techniques involved aiding memorization. One site you can try is: http://www.academictips.org/memory/forlangu.html They mention a very common method called the "mnemonic" method, where you link a word in a language (English perhaps) with a word in your mother tongue (Chinese). It is explained quite well by the site. The site details other methodes as well.