I believe a "a bird" is a subject because I did process of elimination. It can't be a verb, because you cannot "do a bird." It depends what the context of the sentence is as well. Is there a clear object, or subject? Otherwise, I would say subject.
Before the actor spoke, he walked out onto the stage.
It was Crystal Keys first day working in the office. All the staff were really busy this morning. Crystal was asked to miss the induction process to the workplace that most new employees went through. Instead, she was asked to complete a few tasks in the office. Crystal was told the induction would take place after lunch when things settled down a bit. The first task Crystal was asked to complete was to laminate some advertisements. She was unfamiliar with the laminator and managed to melt some plastic sheets on the rollers. This also resulted in her suffering a minor burn w hen trying to remove the plastic. In the process of checking the laminator, Crystal noted that the electrical equipment had not been safety checked in the last 5 years and that the cord was frayed. Next Crystal was asked to change the ink cartridge on th e printer and managed to get black powder everywhere. The office manager became angry about that and sent her to tidy up the stationery room instead. After tripping over some electrical cables that were lying across the walkway, Crystal tried to lift ream s of A4 paper, to get them out of the way. Consequently, she sustained a back strain. Crystal’s first day was miserable and she is not certain she wants to work here anymore.
The role of the idiom is to show how much that person wants to improve in biology by studying all weekend.
There's one thing you need to add. It's how long you have been in love with pop music. Besides that I think it is awesome!
