are more powerful a tool有语法错误吗

Long-term goals are more powerful a tool to drive young people on through their life time.

请问这个句子有语法错误吗？可以这么表达吗？

这种结构是正确的，常见的。限定词之前的修饰语大致上可以分为这么几类：

第一，all和both：all the books, all that work, both the houses, both my parents

第二，分数：half / a quarter / one third his share of the legacy

第三，倍数：She earns two times the salary I earn

第四，such和what：It was such a disaster. What a disaster it was!

第五，as/so/how/too/this/that + 形容词 + a + 单数名词结构：It's so good a bargain I can't resist buying it.

第六，more和less：This is more serious a problem than the other.

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答复语法探讨：我有点惊讶，因为看到这个问题时我直觉上觉得这种结构阅读时经常遇到。实证如下：

其一，The Cambridge Grammar p.435介绍了这种结构。

其二，在Corpus of Contemporary American English中搜索这种结构，得八十多句例证，摘录如下：

Off-roading seems more accurate a metaphor in these tough economic times.

There is no more wonderful a reaction in all of golf for a former Open champion than the walk up the 18th hole each day.

Assuming that negotiations are appropriate in all cases would be no more valid a theory than one that assumes they never are.

There is no doubt that aflatoxin, gram for gram, is much more potent a carcinogen than saccharine, gram for gram.

这种结构经常作表语，但是主语也是可以的：

More immediate a problem was the horde of howling barbarians clustered across the river.

qlf2007 -

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曹荣禄 1秒前

擅长：动词用法,句法问题

一个名词前既有形容词又有限定词时，原则是限定词位于形容词之前。但以下几种情况是例外：

1 当限定词为不定冠词a/an, 且形容词被so, as, too, how, however修饰时，则形容词必须置于不定冠词之前。

2 当限定词为不定冠词a/an, 且名词前有rather, quite时，形容词既可以在不定冠词前，也可以在不定冠词后，取决于副词强调形容词还是不定冠词。

qif2007老师认为指示副词this，that强调的形容词，以及由more/less构成比较接的形容词都可以置于不定冠词前。我查了BNC语料库，没有找到类似的例句。以前看过的语法书也没有类似的介绍。关于此，还需要qif2007老师提供进一步证据。

回复qif2007

在CamG P435看到了您列举的几条内容。

书中没有给出this，that+形容词+a+名词的例句。但既然如此，我可以造两个句子：

Can you read this thick a book?

It is not that long a way to go.

由more/less构成比较级的形容词可以置于不定冠词之前或之后。

more serious a problem, a more serious problem.

这些都是以前没有看到过的，或者没有注意的。谢谢您的解答。