Need advice, please. Trying to explain why not to use the "to infinitive"
I got the question after it was read in a textbook.
"The queen, what she does her entire life is lay eggs"
"lay" is used here as a bare infinitive because it used after the auxiliary verb "does", right?
Why would "to" be added if the sentence is changed to:
"The thing which she does her entire life is to lay eggs."
Does the rule still apply?
The thing which she does is to lay eggs. What she does is lay eggs.
What am I missing here?
Any help would be appreciated.