有：is，are，was，wereCould you dance when you were ten or did you learn later

你10岁时就会跳舞吗？还是之后学的？

Her memoirs were ghostwritten.

她的回忆录是由别人代写的。

Safety rules were disregarded.

安全规定被忽视了。

They were childhood sweethearts.

他们俩是青梅竹马。

The sandwiches were microscopic!

这些三明治小得都快看不见了！

The doors were padlocked.

门都用挂锁锁着。

be动词包括am、is、are、was、were、being、been等形式，其中am只能和我(I)用；is用在三个她(she)、他(he)、它(it)、人名(一个人的时候)；are用在你(you)、我们(we)、他们(they)、人名(两个或两个以上的时候)。