what's it like spending ten days sitting on the bottom of the sea?的句子结构是怎样的一楼的……是spend sometime (in) doing sth....

问题描述:

what's it like spending ten days sitting on the bottom of the sea?的句子结构是怎样的
一楼的……
是spend sometime (in) doing sth....

it作形式主语,spending ten days sitting on the bottom of the sea.作真正主语,spend somtime (on) doing sth.