Unit2辅导41.today we gave our talks in the class about our favorite subjects.give a talk固定短语，意思是“作演讲，作报告”如：Professor Liu will give us a talk about Chinese culture.2.We each brought a painting we made in art class.we made in art class是定语从句，修饰名词painting.each代词，意思是“每个，”强调每一个。
在上面的句子作主语we 的同位语。
each作代词，还常作主语，如：Each of them likes reading a lot. /They each like reading a lot.3.The picture always makes me remember my holiday.She could make her hair stand up with the comb.make…do…固定短语，意思是使某人作某事“。
4．Then Karen combed her hair ten times quickly.time名词，意思是“时间，次数“。
前者是不可数名词，后者是可数名词，注意“一次，两次”分别表示为once, twice.如：I have been to the Great Wall once.How many times have you seen that film?5. can在表示“一般的能力时”,可以与be able to互换,意思相近,都表示“能”,后面均需要接动词原形;但是can只有一般时和过去时(could);而be able to 可有更多的时态形式。
此外,be able to 还可以用于不定式或动名词短语中.在表示过去某种具体的能力，即在某种场合做某事的能力时要用was/ were able to,而不用could.because, because of 都表示“因为……”,because为连词,后面接原因状语从句。
Lesson 15 Karen’s stood up!课文讲解1. Today we gave our talks in the class about our favorite subjects. 今天我们就自己喜欢的科目做了讲演。
[用法归纳]give a talk. 动词短语，“做报告，做讲演”。
talk 在这里是名词：报告。
listen to （have）a talk. 听报告。
We are listening to a talk in the hall. 我们正在大厅里听报告。
典例1He ____us a talk about Chinese history yesterday. A. give B. gave C. gives D. is giving解析： B 通过yesterday 判断该句时态是一般过去时态，故选择give 的过去式gave。
句意：他昨天给我们做一个关于中国历史的报告。
[变式演练]The famous people will give us _____ tomorrow.A. talkB. talksC. a talkD. talking2. We each brought a painting we made in art class. 我们每人带了一幅在美术课上画的画。
[用法归纳]each代词，“每个、每一”，强调单数，上面的句子做we 的同位语。
再如：We each have a new book.我们每人都有新书。
each作代词时常做主语，动词用单数形式，例如：Each of them likes reading a lot.他们每个人都喜欢读书。
典例2_______ of us comes from U.S.A.A. EveryB. EachC. BothD. All解析： B every 意思是每个，但它后面不加of 短语，排除；both 两者都……，all （三者或三者以上）都，后面不跟动词的第三人称单数形式，排除。
