名词短语作状语

We learn English three times a week.

three times a week是频率状语，请问three times a week中是有两个名词短语吗？three times和a week是两个名词短语吗？谢谢！

We learn English twice a week.

twice a week是频率状语，如何理解twice副词+a week名词短语？

看作习惯使用方法，不必剖析。我估计你即了解它意思，也了解怎么用，这就能了。