英文文法一問~!

兩個都啱。
For the rest of my life
歌仔都有得唱，What are you doing for the rest of your life? (呢句其實 grammar 好有問題，What are you doing???應該是What will you be doing... or What will you do..， 但這却是真正歌名，貝沙灣廣告主題曲)
In the rest of my life
例1: I met her in 2002, and I will miss her in the rest of my life.
我在2002年遇見她，在我有生之年，我將會想念她。
在這裡如用 for the rest of my life 就冇咁好 。
例2: I would like to meet a woman who can share my happiness and sorrow in the rest of my life.
Again, 在這裡如用 for the rest of my life 就冇咁好 。
In the rest of my life 是比較強調在我有生之年之內。
I do not quite agree that we seldom use "in" as preposition when we are talking about time.
We use in for nonspecific times during a day, a month, a season, or a year.

圖片參考：http://grammar.ccc.commnet.edu/grammar/gif/cleardot.gif
She likes to jog in the morning.

圖片參考：http://grammar.ccc.commnet.edu/grammar/gif/cleardot.gif
It's too cold in winter to run outside.

圖片參考：http://grammar.ccc.commnet.edu/grammar/gif/cleardot.gif
He started the job in 1971.

圖片參考：http://grammar.ccc.commnet.edu/grammar/gif/cleardot.gif
He's going to quit in August.
We use for when we measure time (seconds, minutes, hours, days, months, years).

圖片參考：http://grammar.ccc.commnet.edu/grammar/gif/cleardot.gif
He held his breath for seven minutes.

圖片參考：http://grammar.ccc.commnet.edu/grammar/gif/cleardot.gif
She's lived there for seven years.

圖片參考：http://grammar.ccc.commnet.edu/grammar/gif/cleardot.gif

For the rest of my life.
在這情況是用for先岩
for exp: I will love you for the rest of my life
I will live with honor for the rest of my life
係時間上好少用in 多數用for, 如

I've been here for a day
I have worked here for 3 months