I know this grammar rule that if the subject contains "do", the predicate "to be" is usually followed by the bare infinitive form of the verb in the object.
But what if the subject contains "does" "done" or "doing"?
1.What he usually does after he gets up is put/putting on the coffee.
2.What should have been done in that situation is evacuate/evacuating immediately.
3.What he resents doing is say/saying "no" to the offer of his friends.
In these cases, what form of the verb immediately after "be" should we adopt?
Bare infinitive?Present participle?Either way?