Yes definitely. I had the same issues. My breathing was all messed up. But copying speech patterns and breathing times as the person who was speaking. Has made me breath and enunciate in the same way. Open your mouth as wide as you can whilst doing this and you will see improvements quick. Just make sure the people who you're copying enunciate really well and speak slowly. Also make it interesting/fun. Use funny scenes, or really intense scenes so that you wont get bored.