現在完成時的幾種常見的句型轉換。

現在完成時可以轉化成一般過去時，還可以轉化成“It is/has been +時間段+since從句(用一般過去時)”等句型。

e.g. Jim has been back for a month.吉姆已經回來一個月了。= Jim came back a month ago.吉姆一個月前就回來了

= It is/has been a month since Jim came back.自吉姆回來已經有一個月了。= A month has passed since Jim came back. I have kept the book for two days. = I borrowed the book two days ago.

= It is / has been two days since I borrowed the book. = Two days has passed since I borrowed the book.

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