gine that it's spring. The birds are chirping, the flies are getting in through the window, the plants are budding their newborn leaves. Now, imagine that you want to tell someone about it all. First, you need a topic sentence to begin the conversation; maybe something like: 'You wouldn't believe how beautiful the birdsongs are this year,' or 'My Gosh, there must be at least a million flies coming in through the kitchen window' or 'The trees and the bushes are bursting with green.'