日本語 Japanese Ask Questions Thread 3

If you have a question about the language, ask it and fellow 4channers might see it and answer it for you.


Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

ハンドバッグを忘れました。
買い物をすっかり忘れていた。

What's the difference? Throw your densest grammar at me, I'll plow through it, but this is really tripping me up.