怎么样区别to在句子中是做介词还是不定式

only United Kingdom Independence Party, sensing its chance, has sided with those pleading for a more considered approach to using green land.

请问to using green land，能否用to use green land.不定式形式？

an approach to sth.

approach 表示“办法”； to 表示 “针对（做）某事（的办法）”，是介词，不是动词不定式符号。所以， to 后接名词、代词或 doing。

Tosummarise,thisisacleverapproachtoacommonproblem.

总而言之，这是一个解决容易见到问题的巧妙办法。

《柯林斯高阶英汉双解学习词典》

We have a very communicative approach to teaching languages.

大家在语言教学中很强调交际教学法。