現(xiàn)在完成時(shí)可以轉(zhuǎn)化成一般過去時(shí),還可以轉(zhuǎn)化成“It is/has been +時(shí)間段+since從句(用一般過去時(shí))”等句型?! .g. Jim has been back for a month. 吉姆已經(jīng)回來一個(gè)月了。 = Jim came back a month ago. 吉姆一個(gè)月前就回來了 = It is/has been a month since Jim came back. 自吉姆回來已經(jīng)有一個(gè)月了。 = A month ha