Dưới đây là những lỗi sai trong các câu và cách sửa lại:

1. **Câu 1**:
- **Lỗi sai**: "mistaken"
- **Sửa lại**: "mistaken" → "mistook"
- **Câu sửa**: "I sure that you have mistook my pen for yours."

2. **Câu 2**:
- **Lỗi sai**: "presenting"
- **Sửa lại**: "presenting" → "to present"
- **Câu sửa**: "Peter is not confident to present his ideas to the class."

3. **Câu 3**:
- **Lỗi sai**: "a fish"
- **Sửa lại**: "a fish" → "fish"
- **Câu sửa**: "It is impossible for fish to climb a tree."

4. **Câu 4**:
- **Lỗi sai**: "me winning"
- **Sửa lại**: "me winning" → "for me to win"
- **Câu sửa**: "Is it possible for me to win this competition?"

5. **Câu 5**:
- **Lỗi sai**: "hearing"
- **Sửa lại**: "hearing" → "to hear"
- **Câu sửa**: "Mr. Brown was relieved to hear his wife was not injured in the accident."

6. **Câu 6**:
- **Lỗi sai**: "be"
- **Sửa lại**: "be" → "to be"
- **Câu sửa**: "Are you certain that he is to be the pickpocket?"

7. **Câu 7**:
- **Lỗi sai**: "astonished"
- **Sửa lại**: "astonished" → "was astonished"
- **Câu sửa**: "Peter was astonished that he accidentally found his childhood toy."

8. **Câu 8**:
- **Lỗi sai**: "to pass"
- **Sửa lại**: "to pass" → "passing"
- **Câu sửa**: "It is difficult passing the test if you don't study hard."

9. **Câu 9**:
- **Lỗi sai**: "were"
- **Sửa lại**: "were" → "will they"
- **Câu sửa**: "Will they be able to swim across that river?"

10. **Câu 10**:
- **Lỗi sai**: "don't aware"
- **Sửa lại**: "don't aware" → "aren't aware"
- **Câu sửa**: "They aren't aware that staying up late is bad for health."

11. **Câu 11**:
- **Lỗi sai**: "study"
- **Sửa lại**: "study" → "studying"
- **Câu sửa**: "It's difficult studying in a foreign country, so students need to prepare for the experience."

12. **Câu 12**:
- **Lỗi sai**: "being told what writing"
- **Sửa lại**: "being told what writing" → "to be told what to write"
- **Câu sửa**: "I’m tired of being told what to write about the tram system in Hanoi."

13. **Câu 13**:
- **Lỗi sai**: "us to take"
- **Sửa lại**: "us to take" → "taking"
- **Câu sửa**: "It's convenient to take a cyclo and observe life in Ho Chi Minh City."

14. **Câu 14**:
- **Lỗi sai**: "surprising"
- **Sửa lại**: "surprising" → "was surprising"
- **Câu sửa**: "I was surprised to learn that there was a tram system in Hanoi a century ago."