I want to say, "I’m speaking Chinese because… 我不要我的妈妈听到我们."
Or "I’m speaking Chinese because… 我要练." (I’m not sure if that’s right, but whatever.) xD
I would appreciate if you could answer in pinyin, I don’t know a lot of characters, only basics.
Edit: If you speak more than one language, you should know that Google translate sucks. I wont use it.