关于这个问题,1. Parts of speech (词性):Noun (名词), Verb (动词), Adjective (形容词), Adverb (副词), Pronoun (代词), Preposition (介词), Conjunction (连词), Interjection (感叹词)
2. Tenses (时态):Present Tense (现在时), Past Tense (过去时), Future Tense (将来时)
4. Direct and Indirect Speech (直接引语和间接引语)
5. Conditionals (条件句):Zero Conditional (零条件句), First Conditional (一般条件句), Second Conditional (虚拟条件句), Third Conditional (过去虚拟条件句)
7. Modal Verbs (情态动词):Can, Could, May, Might, Must, Shall, Should, Will, Would
8. Relative Clauses (关系从句)
9. Reported Speech (间接引语)