let $\displaystyle $\{E_{n}\}_{n\in\Bbb N}$$ be a sequence of measurable subsets such that $\displaystyle $E_n \subseteq (0,1)$$ and let $\displaystyle $\limsup_{n\to\infty} m(E_{n})=1$$, prove that $\displaystyle $m(\bigcap_{k=1}^\infty E_{k}) > 0$$, where m is the measure of Lebesgue.

Any ideas on how to do this?