8B Unit21.I've been there be fore. 我以前去过那里。
①before 副词“以前”。
常与现在完成时连用，也可与一般过去时连用。
He has n ever see n such a huge stone befoftb以前从未见过这么大的石头。
②.............................................. before介词或连词“在之前”，可表示时间、位置、顺序等。
My father usually goes to bed before 9:00 p.m. 我父亲通常在晚上9 点之前睡觉。
（介词）Turn off the light before you leave the roo m 离开房间前关上灯。
（连词）3. Can I join you?我可以和你一起去吗？①join及物动词“加入”，表示加入某一组织、党派、社会团体或某一人群中，从而成为其成员。
join 后常出现club，army，team，group 以及表示人称代词宾格的单词等。
My father joined the army after he finished middle school. 我爸爸中学毕业后就参军了。
Will you come and join us for supper? 你愿意来和我们共进晚餐吗?②take part in “参加/参与某项工作、活动、游戏或会议等”，强调参加者有积极的态度，并起到一定的作用。
take part in之后接名词或动名词。
=join in。
Would you like to take part in/join in the English party? 你愿意参加英语晚会吗？Every one can take part in garde ning.每个人都可以加入至U园艺活动中来。
③join sb.in... “参加到.. 中”。
A lot of students are playing football on the playground. Let 'jsoin them in playi ng football!许多学生正在操场上踢足球，咱们加入到他们当中吧!4. excited形容词为“感到兴奋的，感到激动的”。
be excited at/about sth对某事感到激动；be excited to do sth激动地去做某事；be excited that+从句。
She was really excited about goi ng to Beiji ng.她对北京之行感到非常兴奋。
I was excited that I could have the cha nee to study abroad.我很激动，我能有机会出国学习了。
we re very excited about the exciting new我们对这个激动人心的消息感到很激动。
5.1 don't thi nk it'll be a holiday for me.我认为对我来说这将不是一个假期。
这是一个含有宾语从句的主从复合句，I don't think 是主句，it'll be a holiday for me 是宾语从句。
当主句主语为第一人称，think,believe等动词后的宾语从句为否定句时，要将否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式，这种语法现象就是否定前移。
翻译成汉语时，要注意将否定的意义还原到从句中去。
I don't thi nk that Jenny will come to his party.我认为珍妮不会来参加他的聚会。
I don't think he is right.我认为他不对。
这种结构的反意疑问句的主语和谓语动词必须与宾语从句的主语和谓语动词保持一致。
1 don't think he is a doctor,is he?我认为他不是医生，对吗6.lt comes from the story by Hans Christian Andersen.It comes from the story writte n by Hans Christia n An derse n.它来自汉斯•克里斯蒂安•安徒生写的故事。
come from “来自，从... 来” =befrom，表示某人或某物来自某一地方。
be是连系动词，come是实义动词，两个短语的否定和疑问形式不一样。
He comes from Australia.=He is from Australia .他来自澳大利亚。
Does Ann come from En gla nd?=Is Ann from England?安来自英国吗？7.by介词“由，被”，常构成被动语态。
一Who is this music written by?这是谁写的乐曲？一It's by Mozart.是莫扎特写的。
8.①missOWhen I was abroad」missed my parents very muc我在国外时，非常想念父母。
②miss及物动词“未赶上，错过”。
She missed the early bus.她没有赶上早班公共汽车。
I don't want to miss the basketball game.我不想错过那场集球比赛。
③Miss名词，（用于姓名或姓之前对未婚女子的礼貌的称呼）小姐，女士；（学生对女教师的称呼）老师；（对不知姓名的年轻女子的称呼）小姐。
Nice to meet you, Miss Wang王小姐，很高兴认识你。
I know the answer, Miss.老师，我知道答案。
Miss Smith missed the bus that could take her to see her foreign friend whom she missed史密斯小姐错过了那辆能带地去看望她想念的外国朋友的公共汽车。
9. We're havi ng a fan tastic time her我们在这儿玩得很开心。
have a fantastic time “过得愉快；玩得开心”，八形容词fantastic 还可用good,great和wonderful等词替代。
构成短语：have a good/fantastic/great/wonderful time doing sth开心地做某事。
The girls often have a good time talking at lunchtime.这些女孩午餐时经常聊得很开心。
10. Today we spe nd the whole day at Disn eyla nd.今天我们在迪士尼乐园待了一整天。
whole形容词“整个的，全部的”All the people here have know the whole truth about the matter.这里所有的人都已经知道了这件事情的全部真相11.lt moved at high speed and was really excit ing!它高速转动，的确很令人兴奋!at high speed “ 以高速”，at low speed “ 以低速”。
The bus was travelli ng at high speed.那辆公共汽车在残驰。
at a/the speed of... “以 ... 的速度”。
The car is moving at a/the speed of eighty kilometers an hour. 汽车正在以每小时80千米的速度前进。
12. We were scream ing and laugh ing through the ride.整个乘坐过程中我们都在尖叫、欢笑。
ride可数名词“乘坐（游乐设施），骑，（骑马、骑自行车或乘车的）旅行”It's about twenty minu tes' bus ride from the city to the tow n.从这个城市到那个小镇乘公共汽车大约20分钟的路程。
We all went for a ride in her new car.我们所有人都乘坐她的新车去见风。
ride（rode, ridden）动词“骑（车、马等）”。
He rides his bike to school 他骑自行车上学。
Can you ride a horse你会骑马吗？13. Next,we hurried to a restaura nt to have a quick meal.接着，我们匆匆去了一个餐馆，吃了一顿快餐。
①hurry不及物动词“匆忙，赶忙”If we hurry, we ' ll get there in tiiSe是赶紧的话，我们会及时到哪里。
②名词“匆忙”，in a hurry匆忙地14.0n the way,we met some Disney cartoon characters,suchas Snow White and Mickey Mouse. 在路上，我们遇见了一些迪士尼卡通人物，例如白雪公主和米老鼠。
on the way “在路上”on the/one's way to.“在（某人）去 ... 的路上”，如果后面接副词here, there,home等，则省略介词to。
They are on the way to the park.他们在去公园的路上。
On my way to school,I met my old frie nd.在去学校的路上，我碰到了我的老朋友。
15. such as “例如”。
He knows four Ian guages,such as Russia n and French.他懂4门语言，如俄语和法语。
16. c an ' t stop doing s忍不住做某事They couldn ' t stop laughing when they watched the funny performanee.当他看滑稽表演时，他们忍不住大笑起来。
18. take photos=take pictures 拍照19. After the parade,we watched a 4D film.游行结束后，我们看了一场4D 电影。
watch及物动词，意为“观看，注视”。
watch TV 看电视，watch matches看比赛。