有关八年级英语下册Unit6的知识讲解
unit 6
how long have you been collecting shells?
一.【单元目标】
ⅰ．单词与短语
collect marathon skate pair since raise several stamp kite monster
globe anyone store cake particularly collector common extra topic
capital thousand quite certain miss
in fact 其实；实际上 run out of 用完；用尽
by the way 顺便；附带说说 be interested in 对……感兴趣
more than 比……多 make a list of 列清单
thanks for doing sth. 感谢某人做了某事 think of / about sth. 想起某事
ⅱ．目标句型：
1. how long have you been doing…? 2. i’ve been doing…since…
3. how long did sb. do…? 4. he / she did sth. for…
5. what do you collect? 6. when did you start?
7. how many do you have? 8. what do you like to collect in the future?
9. what is the most common/unusual/interesting hobby?
ⅲ．语法
现在完成进行时
二.【重难点分析】
1. 现在完成进行时
构成：
肯定句：主语 + have / has been + doing
否定句：主语+have/has+not+been+doing
一般疑问句：have/has+主语+been+doing?
现在完成进行时表达“某一动作从过去开始一直持续到现在，有可能还要持续下去”，现在完成进行时的句子中多用延续性动词，如：live，learn，study，work等。
(1)i have been learning english for ten years. 我学英语已经十年了。
(2)she has been skating for four hours. 到现在为止她滑冰已经有四个小时了。
(3)i have been collecting stamps since i was ten years old. 我从十岁起就一直在集邮。
在这几个句子中，have和has是助动词，疑问形式需把助动词提前，否定形式在have或has后面加not，have not和has not可以分别缩写成haven’t和hasn’t，如：
(1)have you been doing your homework since this morning? 从今天早晨起你就一直在写作业吧？
(2)has he been writing the letters to his friend? 他是一直在给他的.朋友写信吗？
(3)i haven’t been seeing films for a long time. 我有很长时间没有看电影了。
（表明没有看电影这个动作从过去一直持续到现在，还要继续持续下去。）
2.现在完成进行时与现在完成时的区别：
(1)现在完成时强调动作的完成，而现在完成进行时侧重的是动作的持续进行。
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