范文：
The experiment remained inconclusive until the last data was analyzed. After months of intense research, the scientists had to admit that their initial hypothesis needed further investigation to remain valid.
（这个实验直到最后的数据被分析后仍然没有结论。经过数月的深入研究，科学家们不得不承认他们的最初假设需要进一步的调查才能保持其有效性。）
常见问答知识清单：
1. What is the past tense of the verb "remain"?
2. Can "remain" be used as a transitive verb?
3. How do you use "remain" in a negative sentence?
4. What is the difference between "remain" and "stay"?
5. Can "remain" be used in passive voice?
6. How do you form the past participle of "remain"?
7. Is "remained" the correct past tense of "remain"?
8. Can "remain" be followed by an adjective?
9. What is the past perfect tense of "remain"?
10. Can "remain" be used in the progressive tense?
详细解答：
1. What is the past tense of the verb "remain"?
The past tense of "remain" is "remained."
2. Can "remain" be used as a transitive verb?
Yes, "remain" can be used as a transitive verb, meaning it can take a direct object. For example, "She remained silent throughout the meeting."
3. How do you use "remain" in a negative sentence?
In a negative sentence, "remain" can be followed by "not" or "never." For example, "He remained unaware of the changes."
4. What is the difference between "remain" and "stay"?
"Remain" is often used to indicate a continuation or persistence of a state or condition, while "stay" is more general and can imply a temporary or longer duration of time in a place or situation. For example, "The light remained on" vs. "She stayed at the hotel."
5. Can "remain" be used in passive voice?
Yes, "remain" can be used in the passive voice. For example, "The children were remained quiet in the classroom."
6. How do you form the past participle of "remain"?
The past participle of "remain" is also "remained."
7. Is "remained" the correct past tense of "remain"?
Yes, "remained" is the correct past tense of "remain."
8. Can "remain" be followed by an adjective?
Yes, "remain" can be followed by an adjective to describe the state or condition it is in. For example, "The garden remained lush and green."
9. What is the past perfect tense of "remain"?
The past perfect tense of "remain" is "had remained." For example, "By the end of the day, he had remained calm."
10. Can "remain" be used in the progressive tense?
Yes, "remain" can be used in the progressive tense to indicate a continuous state or condition. For example, "She was remaining focused on her work."
