My job is___.和My hobby is____.后分别加什么?是dong还是to do?

我的语法书上说
动名词做表语时 主表可倒换
例句就是
My hobby is collecting stamps.
Her job is washing,cleaning,and taking care of the childen.
所以 应该都是加doing
而且此二句也可以改成
Collecting stamps is my hobby.
Washing,cleaning,and taking care of the childen is her job.

同意行言后从的回答；
其实在英文网页中搜索一下，就可以确定这个答案，my hobby is swimming;
my job is to arrange the meeting....

习惯用：
my job is to do ...
my hobby is doing...

都可以。
不定式可以做表语
动名词也可以做表语。