It's too difficult to do.
is
Alan's done the job.
has
It's a silly question.
Is
John's making a trip next week.
is
He's made a cup of tea.
has
It's a quiet neighborhood.
Is
She's excited about the project.
is
It's taken me a lot of time to convince my parents.
has
She's got glasses but never wears them.
has
There's nothing to eat in the fridge.
is
She's been working as a teacher for 20 years.
has