be used后加什么

例句：

It can also be used to mean an expression of sympathy.

它也可以用来表达同情的.感受。

Oxygen could be used to breathe, and hydrogen could be turned into fuel, rocket fuel.

氧气可以用来呼吸，氢气可以变成燃料，火箭燃料。

She was used to her mother's histrionics.

她习惯了母亲装腔作势的样子。

They're used to stretching their budgets.

他们习惯于精打细算。

It's very different to what I'm used to.

这与我所习惯的大不相同。