There were no instances of the disease here until it 'suddenly' appeared last year.
The director's 'sudden' departure leaves the organization's future uncertain.
I was walking down the street when, 'all of a sudden', it started raining.
(..) He's not gonna bother these children anymore. Miss Scout, you think you could tell us what happened? I don't know. All ofa sudden somebody grabbed me, knocked me down on the ground. Jem found me then. Then Mr Ewell, I reckon, grabbed him again, and Jem hollered. Then somebody grabbed me. (..)1962 To Kill a Mockingbird