Be used to & get used to
CHECK WHAT YOU KNOW!!
You can have a try at those online exercises if you feel you already master this concept. If you are successful, just do the task!; if you are not, have a look at the material below so you can learn how this works.
ONLINE EXERCISES
LEARN HOW IT WORKS:explanation & drilling practice.
Here you have a video explaining all this. It's quite informing and entertaining!
NOW SHOW YOU CAN DO IT!