Maybe I can raise your interest in this book: The curious incident of the dog in the nighttime by Mark Haddon. It's a brilliang book about an autistic boy, Christopher Boone, written from his point of view.
Here's the link to the amazon page, where you can also read some reviews.

I have to apologize for not showing up this morning. But I really feel awul. Whenever I stand up I feel awfully dizzy and my knees are wobbly. I wouldn't have managed to get out and teach you anything.
I wish you a nice long weekend and hope we see each other next Thursday.
I will also put some links to exercises on prepositions into the blog. Maybe you are interested.

Dear Kathrinchen,
Welcome to our blog!!!It was really nice to read from you.
As DerDritte (i.e. Marcus) has already mentioned, using the weblog is really easy, and I'm sure if you kindly ask him, he will show you different things you need to know.
But the best way is to practise - you browse through the different sections, click everywhere and simply try out ( you can get links to books, grammar exercises, photos, ....and when you are registered you can also create your own stories)
You can hardly do any damage to it.