10．She treats the boy very well as though he is her son．

分析 她對(duì)這個(gè)孩子很好，好像是自己的兒子一樣．

解答 答案：is-were．考查as though 虛擬語(yǔ)氣．根據(jù)句義可知，這個(gè)孩子并不是她的兒子，所以as though 的從句應(yīng)該用跟現(xiàn)在事實(shí)相反的句式，即過去式，又因?yàn)樘摂M語(yǔ)氣不用was，所以用were．

點(diǎn)評(píng) 考查as though 虛擬語(yǔ)氣．
as though引導(dǎo)條件從句（即假設(shè)部分），從句的時(shí)態(tài)有三種：
1、從句與主句動(dòng)作同時(shí)：He looks as though he were an artist．--用過去時(shí)（am，is，are的過去時(shí)都是were）
2、從句動(dòng)作先于主句動(dòng)作：She speaks English so fluently as  though she had studied English in Britain．--用過去完成時(shí)．
3、從句動(dòng)作后于主句動(dòng)作：He learns English so hard as though he would go to the U．S．A..--用過去將來時(shí)．

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