For是什么句子的标志词？(yii框架的优缺点？)

1、For是什么句子的标志词？

Since 用来说明动作起始时间，for用来说明动作延续时间长度。

I have lived here for more than twenty years.

I have lived here since I was born..

My aunt has worked in a clinic since 1949.

Some new oilfields have been opened up since 1976.

I have known Xiao Li since she was a little girl.

My brother has been in the Youth League for two years.

I have not heard from my uncle for a long time.

注意：并非有for 作为时间状语的句子都用现在完成时。

I worked here for more than twenty years.

(我现在已不在这里工作。)

I have worked here for many years.

(现在我仍在这里工作。)

小窍门： 当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。

1) (对) Tom has studied Russian for three years.

= Tom began to study Russian three years ago, and is still studying it now.

2) (错) Harry has got married for six years.

= Harry began to get married six years ago, and is still getting married now.

显然，第二句不对，它应改为 Harry got married six years ago. 或 Harry has been married for six years.

2、yii框架的优缺点？

Yii是最有效率的PHP框架之一。

优点有以下几点：1.纯OOP2.用于大规模Web应用3.模型使用方便4.开发速度快，运行速度也快。性能优异且功能丰富5.使用命令行工具。6.支持composer包管理工具。

缺点包括：1.对Model层的指导和考虑较少2.文档实例较少3.英文太多4.要求PHP技术精通，OOP编程要熟练！5.View并不是理想view，理想中的view可能只是html代码，不会涉及PHP代码。

3、大树下边有个小兔写出赴韵母？

dashu，xiabian，youge，xiaotu。

复韵母，you有，xiao小。

you有，这个两拼连读音节是零声母y，和复韵母ou相拼组成的。

即，y-ou～you。

xiao小，这是一个三拼连读音节，它是由声母x，介母i和复韵母ao相拼组成的。即，x-i-ao～xiao。

4、xiao是前鼻韵母？

xiao不是前鼻韵母。前鼻韵母有an，en，in，un，vn。xiao是一个三拼音节，声母是x，韵母是ao介母是i。它的韵母是ao，所以不是前鼻韵母。拼音韵母中有前鼻韵母，后鼻韵母，后鼻韵母有ang，eng，ing，ong。还有复韵母ai，ei，ui，ao，ou，iu，ie，ue。声母和韵母结合就能组成一个音节。

5、Xⅰao一声是什么词语

xiao的一声字可组词，如，

削 削铅笔，削铁如泥

枭 枭雄 ，毒枭

销 销售，销毁

硝 硝酸，硝烟

等。

xiao一声词语: 嚣张 消极 消息 消灭 消费 销路 宵夜 削皮 萧瑟 枭雄 潇湘 骁勇 逍遥 硝烟 消炎

6、小i是小米的吗？

不是，这是两款不同的手机，配置，价格也不同。

7、小i是几画？

小i共是5画。小是3画，i是2画