时态：英语的“时间密码”
时态是英语语法的基石，决定了动作发生的时间。以下是核心时态：
- 一般现在时：表示习惯性动作或事实。例句：She speaks English every day. (她每天都说英语。)
- 一般过去时：表示已完成的动作。例句：He visited London last year. (他去年参观了伦敦。)
- 一般将来时：表示未来计划或预测。例句：We will travel next month. (我们下个月将旅行。)
- 现在进行时：表示正在进行的动作。例句：They are playing basketball now. (他们现在在打篮球。)
从句：句子的“扩展器”
从句分为名词性从句、定语从句和状语从句。以下为典型例句：
- 名词性从句：That what you said is true. (你说的那些是真的。) - 宾语从句
- 定语从句：The book that I bought is interesting. (我买的书很有趣。) - 修饰名词
- 状语从句：He when he arrived called his mother. (他一到家就给妈妈打电话。) - 表示时间
虚拟语气：“假设的魔法”
虚拟语气用于表达假设、愿望或建议。构成形式如下：
类型句式例句与现在事实相反主语+would/could/should+动词原形If I were you, I would call him. (如果我是你，我会打电话给他。)与过去事实相反主语+would/could/should have+过去分词If she had studied, she would have passed. (如果她学习过，她就会通过了。)与将来情况可能相反主语+should/were to+动词原形If it should rain, we would stay home. (如果下雨，我们会待在家里。)非谓语动词：“独立的小精灵”
非谓语动词包括不定式、动名词和分词。以下为典型用法：
- 不定式：To learn English is important. (学习英语很重要。) - 作主语
- 动名词：He enjoys swimming. (他喜欢游泳。) - 作宾语
- 分词：Seen from the hill, the city looks beautiful. (从山上望去，城市很美。) - 作状语
倒装句：“打破常规的句式”
倒装句通过调整词序表达特殊语气。常见类型：
- 部分倒装：Not only did he come, but he also brought gifts. (他不只来了，还带了礼物。)
- 完全倒装：Here comes the bus. (公共汽车来了。)
强调句：“突出重点的句式”
强调句结构为“It is/was + 被强调部分 + that/who + 句子剩余部分”。例句：
It was Li Ming who won the prize. (正是李明赢得了奖项。)