范文：
The cat noticed the smell of fish in the kitchen. Suddenly, it began to sniff around curiously. The smell was coming from the leftover fish on the counter, which had been forgotten there. The cat's owner quickly cleaned up the mess, and the cat went back to its usual spot, but it couldn't stop thinking about the tantalizing smell of the fish it had almost captured.
（那只猫注意到厨房里鱼腥味。突然，它开始好奇地四处嗅闻。那股味道是从放在柜台上的剩下的鱼来的，是被遗忘在那里的。猫的主人迅速清理了那堆垃圾，猫回到了它通常的地方，但它无法停止对那诱人的鱼腥味的思念。）
常见问答知识清单：
1. What is the past tense of "smell"?
2. Can "smelled" be used as a verb?
3. How do you form the past tense of "smell"?
4. What is the difference between "smell" and "smelled"?
5. Can "smelling" be used as a gerund?
6. How do you use "smelled" in a sentence?
7. Is "smelled" a regular or irregular verb?
8. Can "smelling" be used as a participle?
9. What is the past participle of "smell"?
10. How do you use "smelled" in a question?
解答：
1. The past tense of "smell" is "smelled."
2. Yes, "smelled" can be used as a verb.
3. To form the past tense of "smell," you add "ed" to the base form, making it "smelled."
4. "Smell" is the base form of the verb, and "smelled" is the past tense form. They are used in different contexts: "smell" is used for present tense, and "smelled" is used for past tense.
5. Yes, "smelling" can be used as a gerund, which is a verb form used as a noun. For example, "She enjoys the smell of fresh flowers."
6. You can use "smelled" in a sentence like this: "I smelled something burning in the kitchen."
7. "Smelled" is a regular verb because it follows the standard past tense conjugation of adding "ed."
8. Yes, "smelling" can be used as a participle, which is a verb form that can be used as an adjective. For example, "The cake was left to cool, and the kitchen was smelling delicious."
9. The past participle of "smell" is also "smelled."
10. You can use "smelled" in a question like this: "Did you smell anything unusual when you entered the room?"
