1）appreciate+it+when（if）+從句這是個(gè)固定句型,it是作形式賓語的成分,that不可以作形式賓語（因?yàn)樾问街髡Z和形式賓語都只能是it）,類似的動(dòng)詞還有l(wèi)ike、dislike、enjoy、love、hate、prefer等.舉一個(gè)例子：
I really hate it if my mom sends me to a school which I don't like at all.
（2）盡管that聽起來是對(duì)的,但根據(jù)語法它是錯(cuò)的.如果非得要用that,可以換成這樣：
A：I will let you get on with your job,jerry.
B：I really appreciate that,Tommy.（此時(shí)that指代前面那件事）
所以,題目如果要變成appreciate that,就要換成對(duì)話的形式：
A：I will do you a fovour, jerry.
B：I really appreciate that, Tommy.
希望您滿意!