Let's Go is a pretty good series of books for kids up to about book 4. But after that it loses direction completely and is difficult to teach and even harder for kids to learn.
This four page Word document makes the English principles in Book 5, Unit 1 more manageable for both student and teacher. (It's also a good exercise on it's own.)
The exercise introduces a very difficult subject for kids... the dreaded UNCOUNTABLE NOUNS!
I have designed this with Thai students in mind and you may have to delete or adapt a couple of things for your students.
I'll be doing similar exercises for all the units in books 5 and 6 over the next few weeks so check by if this is something that can help you.
As usual - everything is neatly laid out with the student in mind.
Let me know if you find this useful...