#一日文法神曲(472) 英文文法假設語語態三部曲，假設語態的省略。
高中必考，if(如果)假設語態的省略，像金庸小說裡，葵花寶典的武功，欲練神功，必先自宮(if)。第一招，去掉if(如果)。第二招，主詞和動詞要顛倒。
依時態分三種句型的省略，分別是，與過去(事實)相反，Had + 主詞，與現在(事實)相反，Were + 主詞，和與未來(事實)相反，Should + 主詞，省略的句型。
口訣，吳宗憲的口頭禪，嘿嘿(had)，我的(were)秀(should)場時間到了 ，放句首 + 主詞，是假設語態的省略。
第一，與過去(事實)相反的省略。
If you had learned English grammar with songs, you would have been an English teacher.
等於
Had you learned English grammar with songs, you would have been an English teacher.
第二，與現在(事實)相反的省略。
If you were I to learn English grammar with songs, you might be a grammar teacher.
等於
Were you I to learn English grammar with songs, you might be a grammar teacher.
第三，與未來(事實)相反的省略。
If I should(萬一) be an American president, I would never manufacture or use nuclear weapons.
等於
Should(萬一) I be an American president, I would never manufacture or use any nuclear weapons.
