在英语中，构造否定句通常有以下几种方法：
1. 使用助动词 "do not" 或 "does not"：
For singular subjects: He does not like coffee.
For plural subjects: They do not enjoy watching TV.
2. 使用助动词 "don't" 或 "doesn't"（do not 的缩写）：
For singular subjects: He doesn't like coffee.
For plural subjects: They don't enjoy watching TV.
3. 使用 "is not", "are not", "was not", "were not" 等形式：
For singular subjects: The cat is not sleeping.
For plural subjects: The dogs are not barking.
4. 使用 "has not", "have not", "had not" 等形式：
For singular subjects: She has not finished her homework.
For plural subjects: They have not eaten lunch.
5. 使用 "can't", "can not", "cannot"（can 的否定形式）：
For all subjects: I can't swim.
For all subjects: They cannot speak English.
6. 使用 "won't", "will not", "would not"（will 的否定形式）：
For all subjects: She won't go to the party.
For all subjects: They would not change their minds.
7. 使用 "should not", "shouldn't", "would not", "wouldn't" 等形式：
For all subjects: You shouldn't eat so much sugar.
For all subjects: They shouldn't have left the door open.
8. 使用 "need not", "needn't"（need 的否定形式）：
For all subjects: You need not worry about that.
For all subjects: They needn't have brought an umbrella.
记住，否定句通常意味着对原句陈述的否定，因此在使用否定词时，要确保整个句子意思清晰。
