業精於勤，事立於豫

句型表達： 

看到 since 與 for ，其主動詞皆使用現在完成式。

1. Since + point in time 特定時間點

例句：I have worked here since 1990. (我從西元1990年開始就在這裡工作了。)

2. For + length of time 時間長度

例句：I have worked here for 20 years. (我已經在這裡工作二十年了。)

1. On March 23, 1999, the musical MaMMA MIAI made its first pubic appearance in London. It _____ the kind of welcome it has been getting ever since.

(1999年3月23日音樂劇「MaMMA MIAI」在倫敦首演，自那時起，它就頗受觀眾的歡迎。)

(A) is given

(B) was given

(C) has given

(D) had given

Ans：(C)

ever since = since 自那時起，ever是語助詞，用以加強語氣。「MaMMA MIAI」自從在倫敦首演後，一直到現在都受到歡迎，故與現在完成式連用。

2. What is so special about green tea? The Chinse and Indians _____ it for at least 4,000 years to treat everything form headache to depression.

(綠茶有任何特殊效用嗎？中國人與印度人使用綠茶來治療所有疾病，上自頭痛下至憂鬱症，至少已有四千年的歷史。)

(A) would use

(B) are using 

(C) had used

(D) have been using

Ans：(D)

have been using it + for + 一段時間，表示過去到現在能繼續使用。

3. May _____ changed jobs twice in her whole life.

(May 在他的一生中換過兩次工作。)

(A) has ever

(B) ever has 

(C) always 

(D) has

Ans：(D)

一生，即是過去延續到現在的經驗，故與現在完成式 has changed 連用。