虛擬語氣表示說話人的主觀愿望、猜疑、建議或與事實不符的假設等，而不表示客觀存在的事實。虛擬語氣是由句中的謂語從句的特殊形式表示出來的。freekaobo將對2016考博英語語法虛擬語氣做歸納和用法。
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'x 一、虛擬語氣的常見類型和句型
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$! (1)由wish引起的表示愿望的虛擬語氣
Kf:!tRE A.用wish表示對現在的愿望時，它所引起的賓語從句中謂語動詞形式為：過去式(be動詞用were)。
q$:7j5E B.用wish表示對將來的愿望時，它所引起的賓語從句中謂語動詞形式為：would, could, might+ 動詞原形。
xrPZy*Y, C.wish用于對過去的事實表示一種不可能實現的愿望時，賓語從句中的謂語動詞形式為：had+動詞過去分詞或could, would + have +動詞過去分詞。
^x \VMd3*w The picture exhibition bored me to death; I wish I had not gone to it.
bW6| &P}X ---“I let Joe borrow our radio for the afternoon.”
y>y2,x+[ ---“That’s all right, but I wish he would buy one of his own.”
|O_ JUl I wish that he weren’t so lazy.
+d6onO{8 (2)had hoped引起的賓語從句中備用語動詞形式為would+動詞原形，表示一種過去未實現的愿望或令人失望的事。
JB~^J5#[Oh His father had hoped that his son would go to business with him, but his son became an artist later.
X[o+Y@bc (3)would (had) rather, would as soon, would sooner和would prefer所引起的從句中要求用過去式表示當時或將來的情況，用過去完成時表示過去的情況，表示希望或婉轉的責備。例如：
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