L.A.
I do not think he is lazy or bored, I think he is confused.
Language arts in English can be confusing.. All of the terminology that we use to make up a proper sentence.. is totally new to him..
We use money all of the time so he could understand how all of that worked. He saw it all of the time. It meant something to him.
We never sit around and ask... What pronoun do we use to describe your grandmother?
Also threatening him with having to go back to second grade, is really never the way to motivate someone. It just frightens them. Taking away electronics for being confused by what he is learning, does not make sense.
Instead you could ask for a tutor to work with him at school, if he is not good at having you help him.. (this is not unusual, many times, parents and their children do not do well in these situations) I know i am not a natural teacher. I can only try to teach based on my way of learning.
You could go to a teacher supply store and purchase a work book for this grade level and "play school" with him.
Have him "teach" you about verbs, nouns, pro nouns.. Use the work sheets together. Or you do them in pencil and let him "grade" YOUR work with a red pencil.. Make a few mistakes, so he can find them.
I remember learning a lot of things on Saturday morning, by watching Schoolhouse of rock cartoons.
Watch these with him and let him listen to each sentence of the song.
Listen to the examples the song gives and see if he can come up with examples.
Here is their Noun Cartoon
http://www.youtube.com/watch?v=Sy72OPgdVuA
Pronoun cartoon
http://www.youtube.com/watch?v=GiPJs096bVE&feature=re...
Verb cartoon.
http://www.youtube.com/watch?v=KU70kFDxg6Q
Adjectives
http://www.youtube.com/watch?v=HpPEQZl6_d4&feature=re...