Up until or up to are used to indicate the latest time at which something can happen, or the end of the period of time that you are referring to. Please feel free to call me any time up until half past nine at night Up to 1989, the growth of per capita income averaged 1 per cent per year
To be up to something means to be secretly doing something that you should not be doing. Why did you need a room unless you were up to something? They must have known what their father was up to
If you feel up to doing something, you are well enough to do it. Those patients who were up to it could move to the adjacent pool His fellow-directors were not up to running the business without him
If someone or something is up for election, review, or discussion, they are about to be considered. A third of the Senate and the entire House are up for re-election
If you are up against something, you have a very difficult situation or problem to deal with. The chairwoman is up against the greatest challenge to her position They were up against a good team but did very well
You use up to to say how large something can be or what level it has reached. Up to twenty thousand students paid between five and six thousand dollars It could be up to two years before the process is complete
If you say that something is not up to much, you mean that it is of poor quality. My own souffles aren't up to much
If you say that it is up to someone to do something, you mean that it is their responsibility to do it. It was up to him to make it right, no matter how long it took I'm sure I'd have spotted him if it had been up to me