I'm not sure that also the United States will also make the difference.

VOA: standard.2009.04.10

"If you ask them whether they will receive a pension and what age, they say "I'm not sure whether I will be in the position of pensioners of today."

VOA: standard.2010.06.16

"I'm sure the whole House will wish to join me in sending our condolences to the families and friends of the five soldiers who have died in Afghanistan yesterday,".

VOA: standard.2009.11.04

"I think the Republicans, if they end up winning both and I don't know that they will I'm sure that they will crow that there is a whole new day dawning and that there has been a rejection of Obamaism and all that,".

VOA: standard.2009.10.23