1. be interested in doing sth. = be keen on doing sth. 对做某事感兴趣；热衷于做某事 ? He is interested in singing. = He is keen on singing.
? They are interested in dancing. = They are keen on dancing. doing---表示动词的现在分词（-ing形式）；即在这个短语中，动词必须用现在分词。 动词变为ing形式分几大类，具体分类第二单元语法课件里有详细讲解。 ? I am interested in playing basketball. = I am keen on playing basketball. ? Are you interested in playing the piano? --- No, I am not.
钢琴属于西洋乐器，所以在play后面要加the；而球类运动（如basketball等）则不用
be interested in sth. = be keen on sth.
对某物感兴趣；热衷于某物
? Fred is interested in sports. = Fred is keen on sports.
? Our teachers are interested in music. = Our teachers are keen on music.
当需要表达的意思是对某物体感兴趣时，不需要加动词，直接加名词或名词短语即可。
2. come from… = be from… 来自于...... ? She comes from China. = She is from China.
主语是第三人称单数，动词后要加s；句中有be动词时，要用is（过去时用was） ? She doesn’t come from China. = She is not from China. 变为否定句时，要注意句中是否有be动词： 有be动词时，直接在be动词后加not；
没有be动词时，则需添加一个助动词（do / does），然后在助动词后加not. ? Does she come from China? = Is she from China?
变为疑问句时，句子中如果有be动词，就将be动词提到主语前，句尾加问号；
如果没有be动词，则需添加助动词（do / does）并放到句首，同时，句中的动词必须变为原形。（comes ? come）
? This movie was based on a real story. = This movie was from a real story. = This movie came from a real story.
这部电影是根据一个真实故事改编的。（这部电影来自一个真实的故事）
be based on...意思是“以...为基础”；
在例句的这种情况中，可以用be from和come from来替换。（其它时候不可以替换） 电影的改编过程，通常都是已经完成的事情，所以大多用过去式。
be动词的过去式为was, were；动词过去式大部分直接加ed，但也有少数特殊变化。 ? Was this movie based on a real story?
= Was this movie from a real story? = Did this movie come from a real story? 变为疑问句时，特别要注意动词的时态；动词过去式决定助动词必须用did.
3. pass sb. sth. = pass sth. to sb. 把某物(sth.)传/递给某人(sb.) ? Can you pass me the cup please? = Can you pass the cup to me please? Can意思是“能够”，属于情态动词。
只要有情态动词，动词永远都用原形，不再受主语影响 ? Tom passed his brother a pen just now.
= Tom passed a pen to his brother just now.
just now意为“刚才”，说明句子是过去时，所以动词要变过去式 ? Did Tom pass his brother the pen just now?
= Did Tom pass the pen to his brother just now?
过去时，句中没有“be动词”，变疑问句时要用“助动词”did
4. each other = one another 彼此，互相 ? We always help each other. = We always help one another.
句中有频率副词always，表示习惯性的动作，说明句子是一般现在时 主语不是第三人称单数，所以动词用原形 频率副词（由高至低排列）：always ? usually ? often ? sometimes ? seldom ? never 总是 通常 经常 有时候 很少 从不 ? Do trees often communicate with each other? = Do trees often communicate with one another? 句中有频率副词often，说明这是一般现在时的句子 主语不是第三人称单数，所以动词用原形 句中没有be动词，变疑问句时要用助动词do
? They trusted each other two years ago. = They trusted one another two years ago. 句中有表示时间的短语two years ago，说明这是过去时的句子，动词trust要变过去式 ? Did they trust each other two years ago? =Did they trust one another two years ago? 过去时的句子，句中没有be动词时，变疑问句时要用助动词did
5. Why not do sth. ? = Why don’t you do sth. ? 不如......（提建议） ? Why not walk to school? = Why don’t you walk to school? 这两个句子的共同点在于，动词都要用原形；
而不同点也很明显，Why not后面直接加动词，但是如果是Why don’t，则必须要加上对于听取这条建议的人的称呼，即例句中的you，然后再加动词。
6. be famous for... = be well-known for... 以......而闻名 ? Beijing is famous for the Great Wall. = Beijing is well-known for the Great Wall. 这两个短语之所以意思相同，仅仅是因为famous和well-known这两个单词意思相同；而短语里的其他部分（be动词和介词for）是完全不变的。
注意well-known的拼写，这是一个独立的单词，中间的短横线“-”一定要写上！
7. offer sb. sth. = offer sth. to sb. = provide sth. for sb. = provide sb. with sth. 为某人提供某物
? Our school offers us books and classrooms. = Our school offers books and classrooms to us. 这个例句中对应的sb.是us，而sth.则是books and classrooms 主语（our school）是第三人称单数，所以动词（offer）要加s（offers）； us是we的宾格，“我们”是在学校里使用书本和教室的人，是“提供”这个动作的承受者，所以要用宾格；
人称代词的宾格在第一单元课件中有详细列表，请自行查阅。 ? Our school provides us with books and classrooms. 主语（our school）是第三人称单数，所以动词（provide）要加s（provides）；
provide这个词本身有“提供”的意思，要为他人提供某物，首先必须准备好该物品；为了便于解释，我们暂时将它定义为“做准备”。 provides us：给我们做准备
那么，用什么为我们做准备呢？
这里涉及到一个伴随的条件，或者说使用的工具，我们用“with”加“具体物品”表示。 ? Our school provides books and classrooms for us. provides books and classrooms：准备书本和教室 准备这些东西给谁用？为了谁而准备这些物品呢？ 当然是为了学生，也就是句中的我们“us”； 为了某人，用“for”加人称或人名来表示。
8. enjoy oneself = have fun = have a good time 玩得开心
短语中的oneself表示反身代词：“某人自己”，但oneself这个词绝不会出现在句子中； 反身代词一共有8个：单数5个（f结尾），复数3个（ves结尾）；
具体内容在第一单元课件中有表格，使用时应根据句子中文意思选择正确的反身代词。 ? We enjoyed ourselves at the beach yesterday. = We had fun at the beach yesterday.
= We had a good time at the beach yesterday. 写同义句时，动词的时态必须保持一致；
不同的短语被替换掉的部分不同，做题时，观察原句必须做到细致、到位。 ? Did you enjoy yourselves at the beach yesterday? = Did you have fun at the beach yesterday?
= Did you have a good time at the beach yesterday?
改为一般疑问句时，首先观察句中有没有be动词，这几个例句中都没有be动词，所以全都需要在句首加上助动词；接下来观察句中动词的时态；此处为过去式，所以助动词必须用did，同时注意把动词全都变为原形。
陈述句中主语为第一人称时，变成疑问句后人称要同时发生变化，全部变为第二人称。 （we ? you , ourselves ? yourselves）
9. buy sb. sth. = buy sth. for sb. 给…（某人）买…（某物） ? Her father bought her a book last week. = Her father bought a book for her last week. 例句中的sb.为her，sth.为a book； bought a book意思为“买了一本书”
这本书是为谁而买的呢？这里用介词“for”加“具体的某人”来表示。
? Did her father buy her a book last week? = Did her father buy a book for her last week?
句中没有be动词，且动词是过去式，变为一般疑问句时，直接在句首加上助动词did， 同时,句中的动词（bought）变为原形（buy），句尾加问号“？”。
10. more than = over 超过...... / 多于...... ? My father is more than 50 years old. = My father is over 50 years old. ? There are more than 20 students here. = There are over 20 students here. 这个短语后面的名词，通常都是可数复数形式
在写同义句的时候，注意看清楚替换部分是哪几个单词
11. be as … as … = be (have) the same … as V．（动词）+ as ... as ... = have the same ... as ... 和......一样......
? Lily is as old as Susan. = Lily is (has) the same age as Susan. ? My dog is as heavy as the baby. = My dog is (has) the same weight as the baby. ? I was as tall as you last year. = I was (had) the same height as you last year. ? This bag is as big as that one. = This bag is (has) the same size as that one. ? The ruler is as long as the pen. = The ruler is (has) the same length as the pen. ? He runs as quickly as my brother. = He has the same speed as my brother.
be动词和动词have的时态必须保持一致。
be as...as 中间用形容词 V.（动词）+ as...as 中间用副词 be / have the same...as 中间用名词
常用搭配：
old................age...............年龄 heavy...........weight...........重量 tall................height..........身高 high..............height...........高度 big.................size..............大小、尺寸 long..............length...........长度 quickly..........speed..........速度
单数 我 主格 I 你 You 她 She 他 He 它 It 我们 We 你们 You 他们 They 复数 宾me 格 you her him it us you them 反身myself yourself herself himself itself ourselves yourselves themselves 代词 人称
1 2 3 1 2 3 人称 I You He, She, It, Tom, My sister… We You They, the students
am is are was were
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