grammar

https://drive.google.com/file/d/0B6Zx1TiHfMXiLTFWWWo1dEY5QkE/view?usp=sharing
https://drive.google.com/file/d/0B6Zx1TiHfMXiSnREYUF0S3Nua3M/view?usp=sharing
https://drive.google.com/file/d/0B6Zx1TiHfMXidjFLaFNfSEt4cFE/view?usp=sharing
https://drive.google.com/file/d/0B6Zx1TiHfMXidi1XLURxUjFQaDA/view?usp=sharing