By the second day, everyone was actively involved in serving meals and clearing away.到第二天所有人都很积极的做饭和清洁

involve in:卷入； 陷入

I don't want to involve in this matter.

我不想牵扯到这件事里面去。

Ellen was changing the routines and habits they'd built up over the last 20 years,艾伦改变了他们在过去20年内形成的习惯

build up:建立

He have build up his own business.

他逐步建立了自己的公司。

they would decide whether or not they were going to speak他们可以自行决定讨论与否

whether or not:无论是 ... 或 ...； 是否

I am deliberating whether or not to buy a new car.

我在考虑是否要买一辆新汽车。

They say "Why am I paying attention to some of these rules?他们问"为什么我们要在意世俗"

pay attention to:注意； 留意

You must pay attention to your study.

你必须专心学习。