The NASA team still is not sure how much of what they have found is water and how much is hydroxyl.

VOA: special.2009.09.30

The scientist says this mission has been planned for many years, but he is not sure when it will happen.

VOA: special.2010.05.25

We are not sure if Muhammad means the favorite sport to watch or to play so we will include both.

VOA: special.2010.01.29

Experts are not sure whether this tribe placed bodies in caves as part of burial ceremonies or for other reasons.

VOA: special.2010.11.10

At the beginning of the talks, the United States was not sure if it wanted all or only part of the Philippines.

VOA: special.2010.07.22

Some of the guests were not sure what to think of Ellen and Doug's celebration -- or even how to describe it.

VOA: special.2011.05.23

The spokeswoman says if you get an e-mail you are not sure about, forward it or send a separate message to ContactETS@ets.org.

VOA: special.2010.02.18

They said they were not sure about his decision to withdraw from university studies to play poker.

VOA: special.2010.07.26

When the show first aired, some of its creators were not sure it would last one season.

VOA: special.2009.11.27

For instance,even native speakers are often not sure when to use "lie" and when to use "lay."

VOA: special.2010.02.11

The darkness made Olive nervous and she stood at the door not sure what to do.

VOA: special.2010.01.09

Scientists are not sure how Buruli ulcer disease spreads or even how it develops in nature.

VOA: special.2009.04.06

When people examine this document, they will say, 'He was not sure about that.'

VOA: special.2009.10.08

But Duncan was not sure that playing Porgy would be right for him.

VOA: special.2010.03.07