I think that it's a useful to learn a foreign-language.

I think that it's a useful to learn a foreign-language. To learn a foreign language well is useful ,I think.I think_ I think it’s very空(use) to learn a foreign language well to learn a foreign language well is useful,I think(改为同义句) 几个英语小问题1.To learn a foreign language well is useful,I think. i think it is easy to learn a foreign language.（改为同义句.） I think that it is important to master a foreign language.(同 I think that it is important to master a foreign language.(改 I think that it is important to master a foreign language.（同 It's.Not difficult ________[learn]a foreign language._______ It,s too useful______(learn)a foreign language He found that it was hard to learn a foreign language.