Here's an outline of 3nd grade JHS topics (supplemented from the Akita AJET Community Wiki):
Passive voice
The food was eaten.
Perfect tense
I have eaten.
Have to
  • I have (a lot of food) to eat.
  • I have to eat (a lot of food).
  • I have (a meeting) to go to.
  • I have to go to (a meeting).
What to how to where to
  • I don't know how to use chopsticks properly.
  • I don't know where I am.
  • I don't know why I am eating Natto.
... for me ...
It is interesting for me to sing enka.
Passive Subject Modifiers
This is a beer made by monks.
Gerund Subject Modifiers
The monks making beer are happy.
Relative pronouns
  • The man who says nothing is wise.
  • That is the bag that I gave you.
Debating skills
  • I think we should go to Tokyo Disney Sea.
  • I agree with you, but in my opinion, Disney Land is more interesting than Disney Sea.
  • Ok, well, you can go to Disney Land by yourself. Let's go to Disney Sea!