练习与体会：
（综合c级the barbie dolls）
barbie has undergone （经历）a lot of changes（变化） over the years and has managed （设法）to keep up with（与…保持一致） current （当前的）时下的trends（趋势） in hairstyles（发型）, makeup（化妆） and clothing（服装）.

ⅴ、现在进行时
1． 形式：
1） 现在进行时由助动词am, is, are＋现在分词构成。第一人称单数用am，第三人称单数用is，其他人称一律用are。
2） 现在分词由动词原形＋ing构成，如learning, making, stopping等。
 
2． 基本用法
1） 用在说话此刻正在进行的动作。
e.g. what are you doing here?
2） 表示现阶段正在进行的动作，而说话此刻并不一定在进行。
e.g. we are doing an experiment（实验） this month.（说话时不一定在做实验）。
   
        3. 现在进行时态的否定结构:
        e.g. we are doing an experiment this month. – we are not…
       
        4. 现在进行时态的疑问句结构:
        e.g. we are doing an experiment this month. – are you doing…
 
提示：
能使用现在进行时态的动词都是可持续的动词（如：read（读）, write（写）, listen（听）），不可持续性的动词一般不能使用进行时态。
比较：
e.g. he is dying(死).
e.g. the bus is coming（来）.
 
考生要注意时态使用中的反常现象，如：
e.g. he is always（总是） sitting（坐）there（那里）, crying（哭泣）.
e.g. he is being nice（友善的）.
 
练习与体会：
（综合a/b级：importance of services）
these people argue（争辩说） that manufacturing（制造业的） jobs, which （经济的） foundation （基础）of america’s middle class（中产阶级）, are vanishing（消失）. they claim（声称） that factory（工厂） workers are being replaced（替代）with a host of （许多的）low-wage（低收入的） earners(挣钱者). have been the economic

ⅵ、过去将来时
由“shall或will的过去式should或would＋动词原形”构成。
表示在过去某一时刻之后将要发生的动作或情况。 过去将来时态如果出现在从句中， 则主句谓语动词通常是是一般过去时。如：
e.g. we wanted(想要) to know （知道）when the english class would begin（开始）.
 
过去将来时的否定和疑问结构：
it would be fine（晴朗的）. 天气会晴朗起来
it wouldn’t be fine.
would it be fine?
 
be going to do...
am/is going to do... →→→→→ was going to do...
are going to do... →→→→→ were going to
 
“be to＋动词原形”
        am/is to do ... →→→→→ was to do...
        are to do... →→→→→ were to do...
 
 “be about to＋动词原形”
        am/is about to do ... →→→→→ was about to do...
        are about to do... →→→→→ were about to do...
 
 “be＋现在分词”
        am/is doing ... →→→→→ was doing...
        are doing... →→→→→ were doing...
 
 
练习与体会：
（综合a/b级：plants（植物） and mankind（人类））
from then on（从那时起） humans（人类） would increasingly （日益地）make their living （谋生）from the controlled（被控制的） production（生产） of a few plants（植物）….
make [get, earn] one's living 谋生