Out of all of the three... Katakana is the worst for me. And sometimes I mispronounce え and い 
So my teacher makes me sing:
え以後、こたえ、いいいいいいい、ですね
（aygo, kotae, iiiiiiii desune）
Which just means... English, Answer, The sound for I and "That's so, isn't it?"

And oh look! I posted :P