你這里還是用樓上的翻譯較好,但沒有必要用just: I'm watching TV before I find something to do.
Until較為正式,且用于句首較多.
請(qǐng)看下面的具體應(yīng)用,供參考：
until
1. 連詞 up to the time when 直到...時(shí)（為止）:
* Wait until the rain stops. 等到雨停了再說吧.
* Don't leave till I arrive. 我不來你不要離開.
* Continue in this direction until you see a sign. 一直朝著這個(gè)方向走就看見指示牌了.
* Until she spoke I hadn't realized she was foreign. 她要不說話我還一直不知道她是外國(guó)人.
* I won't stop shouting until you let me go. 你不放我走我就一直喊叫.
* No names are being released until (ie before) the relatives have been told. 只有在通知這些人的親屬以后才可透露其姓名.
until (also till) 介詞
(a) up to (a specified time) 直到（某一時(shí)刻）:
* wait until tomorrow 等到明天
* It maylast till Friday. 這可能要延續(xù)到星期五.
* Nothing happeneduntil (ie before) 5 o'clock. 五點(diǎn)鐘以前沒有出現(xiàn)任何跡象.
* The street is full of traffic from morning till night. 這條街從早到晚行人車輛很多.
* Until now I have always lived alone. 我一直獨(dú)自生活至今.
* I'd like to stay here up until Christmas. 我想在這兒呆到圣誕節(jié).
(b) up to the time of (a specified event) 直到（發(fā)生某事）:
* The secret was never told until after the old man's death. 這個(gè)秘密在老人去世后才說出來.
* Don't open it till your birthday. 等到你過生日那天再打開.
* She was a bank clerk until the war, when she trained as a nurse. 她戰(zhàn)前是個(gè)銀行職員, 戰(zhàn)時(shí)受訓(xùn)當(dāng)了護(hù)士.