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Why should students use these materials when they have school materials?

The Sentenceparts components are presented both in part and in whole providing students either a particular or a global view of sentence grammar. The components provide students an option to work at a pace comfortable for them, learning each component in an environment familiar to them--sitting before a computer in a familiar work space while experiencing grammar concepts in rich text and video.

What is the connection between knowing grammar and writing better?

"Good grammar" is a convention, but conventions are expected of us for both practical reasons of ensuring better communication, as well as for aesthetic reasons.

Those not knowing the conventions suffer. By knowing the conventions of grammar, compositions improve immediately in conventionally acceptable ways expected by most teachers. Even a simple knowledge of grammar and punctuation helps keep fledgling writers out of trouble.