(1) 非持續(xù)性動詞go, come, leave, borrow, buy, die, join的完成時(shí)的肯定式不能與時(shí)間段連用,若要接用時(shí)間段狀語,則應(yīng)換成相應(yīng)的持續(xù)動詞或狀態(tài)動詞。如:
  He has left. 他走了。
  He has been away for an hour. 他走了一個(gè)小時(shí)了。
  Can I borrow that book? 我可以借那本書嗎?
  How long can I keep the book? 這本書我可借多久?
  注意:非持續(xù)性動詞的否定完成時(shí)可與時(shí)間段狀語連用。
? 如:
  He has not borrowed the book since then. 從此以后,他再也沒有借這本書了。
(2) have / has been to 表示曾經(jīng)去過某地,但現(xiàn)在不在那兒;have / has gone to表示現(xiàn)在已去某地,現(xiàn)在不在這兒。
? 如:
  He has been to Canada, but now he is working in our company. 他去過加拿大,現(xiàn)在在我們公司工作。
  Mr. Li is not at home. He has gone to Shanghai. 李先生不在家,他去上海了。
(3) 完成時(shí)的肯定式常用already,而否定式和疑問句常用yet,但若already用于疑問句時(shí),表示一種出乎意外的驚訝。
?如:
  Have you read it already? 你就看完了?