1. I doubt whether he will want to participate.

2. She was in doubt whether she was right.

3. 3 I doubt whether he is in good faith.

4. He began to doubt whether both he and the world around him were not bewitched.

5. I doubt whether her motives for donating the money are altruistic - she's probably looking for publicity.

6. I doubt whether we can complete out contract in the time available in the available time.

7. Such abasement will only lead people to begin to doubt whether democracy is a living social system.

8. He is - was - an extremely competent forensic biologist, but I doubt whether he would have gone any higher.

9. A computer programmer would almost certainly get a computer to do it that way, but I doubt whether the brain does.

10. Unfortunately, anesthesiologists are often in doubt whether an additional fluid bolus will improve the hemodynamics of the patient or not as excess fluid may even jeopardize the condition.

11. In his description of Cradling Wheat Benton wrote, “Scene in the hill country of East Tennessee in 1928…doubt whether this kind of harvesting can be found anymore—anywhere.”

12. Showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself: I doubt whether her motives for donating the money are Altruistic - she's probably looking for publicity.