說明

現在完成時強調「與現在有關」，常配 for / since / already / yet / ever；一般過去時強調「過去某個時間點結束」，必須配明確過去時間（in 2010、yesterday）。兩者不能和具體過去時間連用完成時。

同類條目

• 主謂一致：就近原則 —— Either you or he is right.
• 定語從句：that 與 which —— The book that/which I bought is good.
• 虛擬語氣：if 條件句 —— If I were you, I would take it.
• 非謂語：doing 與 to do —— I enjoy reading. / I want to go.
• 倒裝：否定詞提前 —— Never have I seen such a thing.
• 比較級：as ... as 與 than —— He is as tall as I am. / He is taller than I am.
• 情態動詞表推測 —— It must be true. / It can't be true.
• 被動語態的基本結構 —— The letter was written by Tom.