I think it's very useful. It may not be immediately apparent to people in Darfur, but in the end it is a contribution towards a solution to their problem."

VOA: standard.2009.10.23

The "is it okay" question is very useful at making your speech a little less casual.

is it okay”问句可以用来让你的对话变得随意一点。

Is it okay 课堂 - SpeakingMax英语口语达人

The "It seems" pattern is very useful.

It seems”句型非常有用。

It seems 课堂 - SpeakingMax英语口语达人