改同义句I find that listening to English tapes is very useful __

I find that listening to English tapes is very useful.
I find _it very_ useful _to_ listen to English tapes.
注:
(a)"very useful" 必须保留.
(b)"find it"; 不必 "find it's ..."
例:
(i) "I find this wine a little sour."
(ii)"I find (it) a little sour"
(不是"find it's a little sour".)

I find _it'svery_ useful _to_ listen to English tapes

【It's】 useful 【to】 listen to English tapes.
I find 【it's】 useful 【to】 listen to English tapes.

it ;to