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1·Not in accord with the rules of a prescriptive grammar.

这是违反语法规则的。

2·Prescriptive grammar is concerned with norms of or rules for correct usage.

规定语法考虑的问题是如何为正确使用制定规范或规则。

3·Descriptive grammar and prescriptive grammar both are very important in English studies.

规定语法和描写语法在英语语言研究与教学中占有同等重要的位置。

4·This comes largely as a result of the change from the strict prescriptive approach to grammar to an attitude that says usage should determine rules.

这很大程度上是由句子语法严格规定到实际用法决定规则的转变造成。