as if(though) / even if (though)从句

1. as if / though
       属于时态型虚拟语气，其动词结构与wish之后的虚拟语气相同。
过去 had done
现在 did（be用were）
将来 were to/should/could/might/would do
 1). She speaks English very fluently as though she were born in England. (实际上不是)
 2). The man talked too much as though he were drunk.(实际上说话人认为他并未喝醉)
 3). He talked as if he had taken part in the Long March.
 4). He operated the machine as if he were a skilled worker.
 5). I remember the whole thing as if it had happened yesterday.
 6). It would be an excellent rule to live each day as if we should die tomorrow.

       注：以上例句1-6 as if /though 引导的是方式状语从句；

      但如果主句的动词是系动词be, feel, look, seem, sound, appear等时，as if / though 引导的便是表语从句了。如下列例句7-11。

7). Mary felt as though Mr. Wang were her father.
   8). When a pencil is partly in a glass of water, it looks as if it were broken.
   9). He appeared as if he had known nothing about it. (他看上去对此一无所知。)
   10). I feel as if we had known each other for ages.
       注意：as if / though之后即可接虚拟语气，又可接陈述语气，试比较：
   11). It looks as if/though it might rain. (好像天要下雨。虚拟语气，与将来事实相反，实际上不会。)
12). It looks as if it is going to rain. (陈述语气，实际上确实会下雨。)
 8.2. even if / though引导的让步状语从句
    属于时态型虚拟语气，说的不一定是事实，往往表示一种虚拟的让步，其时态结构与if 引导的虚拟条件句一样。

过去 had done
现在 did（be用were）
将来 did；should do；were to do

 1). Even if I were rich, I would work.
 2). I won’t lend you any money even if I had money.
 3). Even though I had been with you then, I could not have helped you.
 4). We wouldn’t lose heart even if we should fail one hundred times.
 5). Even if he had been there, I should have said the same thing.
 6). Even though you had enough money, you could not buy the lost time.
 7). It is better to invite him even though he should rufuse.
      注意：Even if / though也可引导陈述语气的句子，表达一种真实的让步。试比较：
 7). Even if it rains tomorrow, I will go sighting with you.(情况真实，确实照办)
 8). Even if I become a millionaire, I shall always be a socialist. （陈述语气）