The child that you babysit had some kind of accident. He's upset and crying. He's trying to tell you about the accident, but it doesn't make sense. You tell him to start telling the story again in order.
Hold on, hold on. Start at the beginning.
children, kids, story (topic), wait 
You're a receptionist in an office. An employee at the company is waiting for a package and asked if it had been delivered yet. It hasn't, but you want to let her know that you'll bring it to her when it comes. You say:
I'll keep an eye out for it.
Your roommate wants you to come into the living room to look at a funny video he saw on YouTube. You're trying to work on writing a cover letter for a job application, and you want to finish it. You answer:
Hold on a sec; I'm in the middle of writing something!
casual, interruption, progressive aspect, wait One of the people who works under you came to your office to ask a question. He asked you "Can I ask you something?" You were typing an urgent email and want to finish it, so you answer:
Can you give me just a minute to finish writing this?
boss (speaker), email (topic), gerund, interruption, office, wait, work, 日本語サポート Your wife was working on a document on the computer at home. The program crashed, and she's upset because she thinks all of the work she did is lost. You think she might be able to get the file back again. You say:
Hold on — you might be able to recover it.
command, computer, home, interjection, modal, problems, recover, tech support, wait 