.表示程度或数量,表示"达到……程度或数量",相当于as far as, to。如:
Up to ten people can sleep in this tent.这个帐篷至多能睡十人。
Everyone has his part to play, from the office boy up to the president.从办公室勤杂员到董事长,每个人都有自己的事做。
Our football team played up to its best in the last League matches.我们的足球队在上届联赛中发挥了最高水平。
2.表示时间限制,"直到……为止",相当于till(也可用up till)或until。如:
He was here up to a moment ago.他刚才还在这儿呢。
The No. 5 bus runs up to 9 o'clock in the evening.五路公共汽车一直开到晚上九点。
注意:在将来时态中,应用until或till为好。如:
I'll wait for you until / till ten o'clock tomorrow.我将等你到明天十点钟。
3.表示"够……;合格做……;有资格做……",相当于good/well/clever enough for或fit for。如:
Michael is not really up to the job.迈克尔确实不胜任那项工作.
My German isn't up to translating that letter.我的德语还不行,翻译不了那封信。(to为介词,接V-ing形式)
Do you feel up to going out, or have you still got a headache?你觉得可以出去还是仍觉得头痛?
4.表示"责任"、"义务",相当于the duty or responsibility of。如:
It is up to us to do our best now.我们现在务必要尽最大努力。(sb.后接动词不定式)
5.表示"该……做出决定,取决于",相当于decided or chosen by。如:
-Shall we go out for dinner or eat at home?
-It's up to you.
-我们是出去吃饭还是在家吃呢?
-那要由你决定。(you后省略了to decide).
6.表示"做;忙于"或"从事于",相当于doing或busy doing/ with。(非正式语体中)如:
The children are quiet; I wonder what they are up to!孩子们很安静,我不知道他们在捣什么鬼!
What are you on earth up to?你究竟在搞什么名堂?
7.表示"知道"或"识破",相当于know, aware of。如:
He is not up to many things about sports.他对体育运动知道得很少。
They cannot deceive me, for I'm up to all their tricks.他们欺骗不了我,因为我能识破他们所有的诡计。 up to
（数目）到…之多
up to 100 men
可达一百人
直到（某个高级职务）
Everyone works, from the lift boy up to the President.
从电梯工人到总经理人人都工作。
一直到 (= up till)
Up to now, Mr scott has sent a great many requests for spare parts and other urgent messages from one garage to the other.
到目前为止,斯科特先生从一个汽车修理部向另一个汽车修理部发送了大量索取备件的信件和其他紧急函件。
胜任
Michael's not really up to that job.
迈克尔确实不胜任那项工作。
be up to
做（坏事）
What in the world are you up to?
你到底在搞什么鬼？
(= get up to)
在不同的词组中，意思比较多
像:
drive up to——开车到
go up to ——走到，走上前
live up to
1．reach or maintain a certain high standard达到；不辜负（期望）；无愧于
2．act according to；agree with；follow 遵守（原则）；履行（诺言）等
run up to——跑到（某人面前）
walk up to——走到
add up to 总计，一共
be up to ——由某人决定
be up to——暗中做某事
Up to date（或 up-to-date）
是形容词，可作定语或表语，解作“新式的”、“现代的”、“到目前为止最新的（latest）”。
Step up to
意思是「走进、踏进」。
Cracked up to be
是一个约定俗成的说法，意思是generally believed to be or regarded as being（被吹捧）。