You are presumptuous when you do something you have no right to do, and it feels rude — as if you have already decided you may take that seat, that favour, or that right to speak for someone else. “It would be presumptuous of me to answer for her” is a polite way of saying “I should not act as if that is mine to do.” Younger speakers may just say rude, pushy, or out of line; this word is a little more educated, and it names a particular kind of rudeness: taking too much for granted.

You are presumptuous你是presumptuous(冒昧、放肆)的 when you do something you have no right to do當你做了一件你根本沒有權利做的事， and it feels rude而且讓人覺得很不禮貌 — as if you have already decided you may take that seat, that favour, or that right to speak for someone else——好像你已經自己認定可以坐那個位子、拿那個好處，或是替別人發言。 "It would be presumptuous of me to answer for her" is a polite way of saying'It would be presumptuous of me to answer for her'(我替她回答就太冒昧了)是一種客氣的說法，意思是 "I should not act as if that is mine to do."'I should not act as if that is mine to do.'(我不該表現得好像那是我該做的事)。 Younger speakers may just say rude, pushy, or out of line年輕人可能就直接說rude、pushy，或out of line； this word is a little more educated這個字比較有教養、比較書面一點， and it names a particular kind of rudeness它指的是一種特定的沒禮貌： taking too much for granted就是把太多事情都當成理所當然。

It is not a compliment.

It is not a compliment這不是稱讚。

Though actually, people also use it lightly, almost with a smile, when they are about to ask a big favour: “This is a bit presumptuous, but…” Do not confuse it with presumptive, which is about a fair guess, not about manners.

Though actually不過其實， people also use it lightly, almost with a smile人們也會輕鬆地用它，帶點笑意， when they are about to ask a big favour在準備開口拜託一個大忙的時候： "This is a bit presumptuous, but…"會說'This is a bit presumptuous, but…'(這樣講有點冒昧，不過…)。 Do not confuse it with presumptive別把它跟presumptive搞混， which is about a fair guess, not about mannerspresumptive講的是合理的推測，跟禮貌無關。