Hi Jun, This is a good question. Essentially, 'by' and 'at' refer to different types of prepositions. But, to make things a little less complicated, think of saying 'at night' as meaning doing something at a particular time in the night. I will go to sleep 'at night', for example. So, maybe 9 pm. Alternately, 'by night' suggests that something needs to be done during the night - so, not necessarily at a specific time, but definitely in the night time. So, for example, 'I will do my homework by night' , meaning I will not do it during the day, but rather by night - in the night - so to speak. I hope this helped. Nice question. Take care.

Sure: Something I had taken for granted might not even last, as nothing is guaranteed. Have a nice day :)

Hi Angelina, Firstly, the sentence isn't really correct. It's syntax isn't quite right. Despite this, the sentence means this: The speaker is trying to say that he is just accepting, or taking someone and their presence, as a guarantee. In English, when we say 'taking something/someone for granted' we mean that we have become used to their/its presence and no longer show it/them the proper appreciation. In this case, the person she is taking for granted may not even be a guarantee - that is to say, may not be there for much longer. His/her presence is not something that is promised nor will it always be there. Thus - it might not even last. Essentially, the speaker has stopped appreciating something that may not even be there for much longer. It is a sad statement. I hoped this helped, Angelina. Have a nice day, Ash

Ah... I think it's almost a matter of necessity now, not preference, but definitely coffee.

Hi Evita, This is actually a quote from Walter Scott. In it he's trying to say that in our attempts to deceive, lie, and plot the demise of others, we often get caught up and therefore hurt ourselves in the process. I hope this helps, Kepp well :)