Whether to do it or not is up to you
这里up to you表示由你决定
I think I am uwww.souquanme.comp to this task.
我觉得我胜任这个任务

The number of the population in China hasEfOqFq been up to 1.3billion for a few years.

I feel a bit out of form today; I'm afraid my tennis won't be up to your st搜趣网andard.
我今天略感不适，恐怕我的网球水平达不到你的标准。
The little girl ran a temperature and had to be up to bed.
那个小女孩发烧了，得让她上床躺着。
Where's that naughty chwww.souquanme.comild now? I'm sure he'll be up to no good wherever he is.
那调皮孩子哪儿去了? 我看，他到哪儿也做不出好事来。

It is up to him to搜趣网 clean our classroom today. 今天应由他做教室清洁。
如果还有问题的话，可以去小马过河问问那里专业的英语老师，谢谢！