1. I have a different teacher for each subject.
(What is the part of speech of 'for each subject'? What does it modify?)
2. I am now in the first grade at Washington Middle School.
(What is the part of speech of 'at Washington Middle School'? What does it modify?)
These are both prepositional phrases. Take a look at my answer to you earlier and apply that information to these two sentences.
Please re-post with what you think about each one.