by sb引导什么从句

　　例句：

　　It is a good thing that English can be spoken (by sb.)

　　这是一件好事- - -英语可以被(某人)说。

　　Now you are talking: used to express interest or approval on what was just mentioned by sb.

　　用以表达对刚才对方的`话表示兴趣或赞同。

　　Schwarzenegger signed the bill, SB-54 by Senator Mark Leno (D), on Sunday, his office said.

　　其办公室称，施瓦辛格周日在参议员马克·莱诺(D)签署的 SB-54 法案上签字。