1 is your answer! Mark brainliest, please <3
I think it’s the exposition. Hopefully I’m right and this helps!
That the play was so interesting they were glued to their seats
When using the perfect tenses of verbs, it's necessary to add a helping verb.
For example: I have been working on that paper for weeks.
Have and been are helping verbs, and the whole tense is called present perfect progressive.