Here is a list of the 100 most frequently used English words. About half of everything you read in English will be these 100 words! Do you know all of them? If you don’t you can learn about them with the Learners Dictionary. 
If you would like more, here is a list of the 1000 most frequently used words:
- In order of how often they are used
- In alphabetical order (with links to definition and pronunciation)
it is useful for my kids to learn basic english