not exactly: used for saying that something someone says is not completely right (用于纠正某人说过的话) 并非如此；不完全是这样 《麦克米伦高阶英汉双解词典》

“You’re leaving, aren’t you?”  “Not exactly, I’m just going on holiday.”

“你要离开，是吧？”“不全对，我只是去度假。”

not really: used for saying “no” without being very definite.事实上没有；不全是《麦克米伦高阶英汉双解词典》

“Was he sorry for what he’d done?” “Not really”

“他为自己的行为感到懊悔了吗？”“并没有”

练习：

D  1. --- “Could we put off the meeting?” she asked.

--- “_______.” He answered politely. “This is the only day everyone is available.”

     A. Not likely   B. Not exactly C. Not nearly         D. Not really    07江苏

B  2. ---So you gave her your phone?

---______she said she'd return it to me when she could afford her own.

     A. My pleasure    B. Not exactly    C. No doubt   D. All right    11全国2

A  3. --- Did you have a good time in Thailand last week?

--- ______, it was too hot.

     A. Not really     B. Yeah, why not    C. Oh, great    D. You’re right   08辽宁

C  4. --- Was Martin sorry for what he'd done?

--- _______. It was just like him!

     A. Never mind    B. All right     C. Not really    D. Not surprisingly    07安徽

B  5. --- Have you been wasting time on computer games again?

--- ______.I've been studying a lot and I need a break.

 A．No way               B．Not really  

 C．I don’ t agree      D．I couldn’t agree more   07山东

C  6. --- Was he sorry for what he'd done?

--- ________.

     A No wonder    B Well done  C Not really  D Go ahead    10全国1

B  7. ---Have you played baseball before? We need one more player.

---______. I like ball games, so I believe it will be to learn baseball.

     A. Sometimes    B. Not really   C. Never mind   D. That's cool    10重庆

B  8.--- Do you enjoy your present job?

--- _______. I just do it for a living.

     A. Of course     B. Not really    C. Not likely     D. Not a little   10江西