I felt it would be presuming on our personal relationship to keep asking her for help.

我觉得总要她帮忙就是利用了我们的私人交情。

Two sailors are missing, presuming drowned.

两个水手失踪，推测已经被淹死。

I presume that someone is presuming a joke.

我猜是有人在开玩笑。

Are you presuming to tell me how to drive my car?

你竟胆敢来指点我怎么开汽车？

Presuming this is what she actually said, does this surprise you?

假设她真的说了这些话，你会感到意外吗？