每次我们见到李先生的时候我们都会和他打招呼。
what/who/which/when/where/how+ever也可用于疑问句中，比what/ who/ which/ when/ where/ how语气更强，意思是―究竟是······？” Whoever did such a foolish thing? 到底是谁做了这么愚蠢的事情？ Step 3. Exercises Comprehension Vocabulary & Structure Translation
Part Three Grammar: The present simple tense & the past simple tense(一般现在时和一般过去时) 一、一般现在时
一般过去时主要表示过去某一时间发生的动作或存在的状态。一般过去时用动词的过去式表示。主要有以下几种用法：
1 表示在过去的某一时间发生的动作或存在的状态，常与表示过去时间的词语连用：yesterday, this morning, just now, a moment ago, in May, last night/week/year, once upon a time, the other day,before 等。 e.g.
1) He left for（出发去某地） London yesterday. 2) We visited their university last Friday. 3) She suffered a lot in her childhood. 2 表示过去习惯性的动作。 e.g.
1) We often played tennis together last year.
2) Sometimes we went to the countryside to visit our uncle when we were young. 3表示客气的询问，常用于口语中，代替一般现在时，使口气显得委婉。 e.g.
1) I wondered if you could give me a lift. 2) I wanted to ask if I could borrow your car.
Part Four Writing
Notes: 主题句是某一段落主旨大意的概括，它能引导读者的思路，使段落的中心思想一目了然。大多数的主题句出现在段落的开头，开宗明义；有些主题句出现在段尾，概括全段；有时主题句也出现在段中。还有些段落没有明显的主题句，需要读者自己来概括总结。 Samples Exercises
1. A 2. A 3. C
Writing - Additional examples:
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1 主题句置于段落开头：
The beach party was a total disaster. The cooler leaked and all the ice melted, so we drank warm Coke. Also, most of the potato salad was spoiled. Some kids charged across the blanket and kicked sand onto the fried chicken. Bob bought two rackets but forgot the shuttle.
该段的主题句在开头就清楚表明海边晚会完全是场“灾难”。下文围绕这一主题展开了具体介绍：冰箱坏了，冰块融化了，他们不能喝冰冻可乐；土豆沙拉大部分坏掉了；一些孩子还把沙子踢到了炸鸡上；Bob 带了球拍却没带球。 2 主题句置于段落中间：
Body language is communication by facial expressions, head or eye movements, hand signals, and body po