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資料來源：http://englishhome.org/archives/6954

型態

英文的未來完成式有兩種不同的型態，即 “will have done" 和 “be going to have done"。與未來簡單式不同的是，這兩種未來完成式通常可以互換。

Will 型態的未來完成式

will have + 過去分詞

例句：

• Simon will have perfected his English by the time he comes back from the U.S. (賽蒙從美國回來的時候，他的英文將已精進)
• Will Simon have perfected his English by the time he comes back from the U.S.? (賽蒙從美國回來的時候，他的英文將已精進了嗎？)
• Simon will not have perfected his English by the time he comes back from the U.S. (賽蒙從美國回來的時候，他的英文將不會更加精進)

Be going to 型態的未來完成式

am/is/are + going to have + 過去分詞

例句：

• You are going to have perfected your English by the time you come back from the U.S. (你從美國回來的時候，你的英文將已精進)
• Are you going to have perfected your English by the time you come back from the U.S.? (你從美國回來的時候，你的英文將已精進了嗎？)
• You are not going to have perfected your English by the time you come back from the U.S. (你從美國回來的時候，你的英文將不會更加精進)

資料來源：http://englishhome.org/archives/6954