我想我不能按时完成，也不能一个人完成。

I don't think I can finish it on time or by myself.

youdao

我们必须考虑到我们可能不能按时完成这个项目的情况。

We have to allow for the possibility that we might not finish this project on schedule.

youdao

如果你不能按时到达，应该预先通知他们。

If you can't arrive there on time, you should warn them.

youdao

By our informal count, however, we and the Afghan commandoes we work with were stopped on 70 percent of our attempts because we could not achieve the requisite 11 approvals in time.

粗略估算了一下，与我们一道工作的阿富汗突击队,有70%的尝试都失败了,因为我们不能按时拿到所需的11个批准。

普林斯顿公开课 - 国际座谈会课程节选