Immerse yourself in the language as much as you can. Like JR mentioned - TV, music & movies can help a LOT.
Find native speakers to speak with on a regular basis.
Practice talking to yourself in your target language (out loud) when you're at home. Say what you're doing and how you're doing it in your target language as you do it.
Using your target language as much as possible will help your brain form those new pathways and retain what you're learning.