Doubt n. 懷疑，疑惑 vt 懷疑，不信
在肯定句中，doubt後面一般接whether/if, 在疑問句和否定句中，doubt後面接that引導的賓語從句。
1. There is no doubt that...「毫無疑問」，引導同位語從句，用來說明doubt的具體內容。
There is no doubt that Jerry is suitable for the job.
毫無疑問傑裡適合這份工作。
There is no doubt that it』s very cruel to kill animals for money.
毫無疑問為了金錢而殺害動物非常殘忍。
There is no doubt that the earth is becoming warmer and that it is human activity that has caused this global warming rather than a random but natural phenomenon.
毫無疑問，地球正在變暖，並且全球轉暖是人為的，而不是隨意的自然現象。
There is no doubt off his success. 毫無疑問，他一定會成功。
2There is some doubt whether...「對…持有疑問」
There is some doubt whether she will come on time.
她是否會準時來有點讓人懷疑。
There is still some doubt whether the autumn sports meet will be held in our school but there is no doubt that it will be held soon after the National Day holiday.
秋季運動會是否在我們學校舉行仍有疑問，但國慶節假期後很快就舉行是毫無疑問的。
3. I doubt whether/if ...=I have doubts whether /if
「對…確信，對…毫不懷疑」
I always had doubts whether he would be the best man for the job, but now I don』t doubt that he can do it.
我總是擔心他是否是那個適合做這項工作的人，但現在我相信他可以勝任。
4. Without doubt...毫無疑問…
5. I don』t doubt/never doubt that...我不懷疑…， 我相信…
6 in doubt 不肯定
no doubt 無疑地
beyond/without doubt 無疑地，確實地
7 含有引導的同位語從句的類似句型
There is no chance/possibility that...沒有可能
There is a chance/possibility that... 有可能
There is a high chance that her daughter will pass the exam to go abroad to study.
她的女兒很有可能會通過考試，去國外學習。
習題
1 It seemed to me that she was in doubt _____ Timmy lived or died.
A. Why B. how C. that D. whether
D 對我來說似乎她不確定Timmy 的生死。
2. There is no doubt ____ international cooperation is the key to ____ with cybercrime, as Vinton Cerf has said that the problem of cybercrime is ____ huge that it requires UN to form a special agency to act as an international referee or steward.
A whether, doing, so B. that, dealing, so
C whether, dealing, such D.. that, doing, such
B. 無疑國際合作是應對網絡犯罪的關鍵，正如溫頓瑟夫所說，網絡犯罪問題如此嚴重，以至於需要聯合國建立一個特別機構充當國際裁判或管理員。
3.______ a certain doubt among people as to the practical value of the project.
A. It has B. They have C. It remains D. There remains
D這個項目的實用價值如何，在人們當中還有一定的疑問。
4. ____ is now no ___ that global warming is a threat to us all.
A .There, doubt B. There, need, C. It, doubt D. It, need
A 毫無疑問，現在全球變暖對我們大家是一個威脅。
6. There is no doubt ____ everyone of us wants to be successful, but we can』t always avoid failure.
that毫無疑問，我們每個人都想成功，但是我們總是無法避免失敗。
7. I doubt ___ the gold ring belonging to my mother was stolen by the young man.
whether 我懷疑我媽媽的金戒指被那個年輕人偷走了。
belonging to my mother現在分詞短語作定語修飾ring。
8. 根據漢語提示補全句子
_____ ______ ______ ______ _______(毫無疑問） stress can lead to physical illness.
There is no doubt that毫無疑問，壓力會使人身體生病。
9. ______ ______ _____ ______ _______(有可能） the company will suffer a great loss this month.
There is a chance that 這個公司這個月有可能損失巨大。
10. The theory put forward by the scientist is wrong ______ ______(毫無疑問）。
without doubt毫無疑問這個科學家提出的理論是錯的。
put forward by the scientist 過去分詞短語作定語修飾theory.