时态：动词时间的精确表达
英语时态是描述动作或状态发生时间的核心系统。主要分为四大基本时态，各具时态特性：
- 一般现在时：表示习惯性动作或客观事实
- 一般过去时：表示已完成的动作或过去状态
- 现在进行时：强调动作正在进行（常与ago连用）
- 一般将来时：表示未来计划或预测
例句：
She speaks three languages fluently. (她精通三门语言 - 一般现在时表习惯)
He visited the museum yesterday. (他昨天参观了博物馆 - 一般过去时表完成)
The children are playing in the garden now. (孩子们现在正在花园里玩耍 - 现在进行时表进行中)
We will travel to London next month. (我们下月将去伦敦 - 一般将来时表计划)
从句：复杂句的骨架结构
从句是嵌入主句的子句结构，按功能可分为以下三类：
定语从句
修饰名词或代词，关系代词作主语时，其谓语必须使用单数形式，考试常考点为关系词混淆
例句：
The book that I borrowed belongs to Tom. (我借的那本书属于汤姆 - that为主语，borrowed为单数动词)
She is the student who won the award. (她就是获奖的学生 - who为主语，won为单数动词)
状语从句
修饰动词、形容词或副词，引导词如when, because, although等需特别注意分词省略规则
例句：
Although it rained, they went hiking. (尽管下雨了，他们还是去远足了 - 虚拟倒装省略should)
When he arrives, tell him I’m busy. (他一到就告诉我正在忙 - 一般现在时表将来)
名词性从句
充当名词成分，包括主语从句、宾语从句、表语从句三类，谓语必须使用陈述语序
例句：
The fact that she admitted her mistake surprised everyone. (她承认错误的事实让所有人都惊讶 - that引导主语从句，admitted是谓语)
He said that he would help. (他说他会帮忙 - that引导宾语从句，would help是宾补)
虚拟语气：非真实情境的表达
虚拟语气用于表示假设、愿望或非既定事实，分为三型：
条件式
与现在事实相反：动词用一般过去式（主语为第三人称时）
例句：
If I had more money, I would buy a car. (我要是有更多钱就会买辆车 - 与现实相反)
If they had studied harder, they would have passed. (他们本可以及格 - 与过去相反)
建议式
动词用should + 动原或有were to结构
例句：
It is important that he should stay calm. (他保持冷静很重要 - should可省略)
I suggest that she were to attend the meeting. (我建议她出席会议)
非谓语动词：动词的延伸形式
非谓语动词包括不定式(to do)、动名词(-ing)和分词(-ed/-ing)三种形式，各有独特用法
不定式
表示目的、结果或可能性，被动式需加be done
例句：
She works hard to succeed. (她努力是为了成功 - 表目的)
To be honest, I don’t like it. (老实说我不喜欢 - 表让步)
He was glad to see them again. (见到他们他很高兴 - 表被动)
动名词
作主语或宾语时需保持单复数一致
例句：
Swimming is my hobby. (游泳是我的爱好 - 作主语)
I enjoy reading novels. (我喜欢看书 - 作宾语)
分词
现在分词表主动/进行，过去分词表被动/完成
例句：
Excited, the audience cheered. (兴奋的观众欢呼 - 现在分词表主动)
Seen from the hill, the city looks beautiful. (从山上望去看城市很美 - 过去分词表被动)
倒装句：句式强调的技巧
倒装句通过改变常规语序实现强调效果，分为完全倒装和部分倒装
完全倒装
助动词/情态动词提前至主语前
例句：
Never have I seen such a beautiful sunset. (我从未见过如此美丽的日落 - never提前)
Suddenly appeared the thief. (突然出现了小偷 - suddenly提前)
Scared was the child of the thunder. (孩子被雷声吓坏了 - scared提前)
部分倒装
将助动词/be动词/情态动词置于主语前
例句：
Not only did he apologize, but he also offered compensation. (他不仅道歉还赔偿了 - Not only提前)
Had he arrived earlier, he would have caught the train. (如果他早点到就能赶上火车 - Had提前虚拟倒装)
Hadn’t you helped me, I would have failed. (要不是你帮我我就失败了 - 否定条件省略not)
强调句：信息焦点的强化
强调句结构为“It is/was + 被强调成分 + that/who + 主句”，常用于考试题难点
例句：
It was Tom who knocked at the door. (正是汤姆在敲门 - 强调主语Tom)
It was last Tuesday when I met him. (正是在上周二我遇见他的 - 强调时间状语)
It was because he was tired that he didn’t come. (他没来是因为累了 - 强调原因状语从句)