Learning sentence structure

There are so many particles in Japanese! I'm still a little lost on which one's to use in what context. I've gotten down WA, KA and almost O. Masu sen was easy for me to catch on to. But turning the verbs into the masu form! Ugh! I get the basic concept but somehow manage to still mess it up on my quizzes in class. Any help would be appreciated!

i think you learning it wrong. you need to reinforce this stuff with easy example and lessons. 

just learning this stuff right away is first bad for retention and also makes it harder to understand. its best to learn from example and repition