In an office
Man: Oh, is my ID complete now?
Secretary: Yes, it’s complete. You see how to fill in a form.
Man: Oh, yes, very nice.
You see how to fill in a form
Is it an Interrogative Sentence?
Does it need a question mark? ←
It is a declarative sentence?
When written, there is no way to know if it’s a statement or question. In the video the tone of her voice makes it clear that it’s a question.
It’s hard to describe the difference in tone. Statements are usually spoken in a flat voice. With a question the pitch raises at the end.
Here is a good video. If you listen to it you can hear what is hard for me to describe with written words.
Thank you so much, NearlyNapping
To me, it looks like a statement or a declarative sentence meaning that the speaker understands and appreciates his ability to fill in the form.
Thank you so much, Anglophile