How To Say "Can You Speak English?", "I Can Only Speak Little Chinese", "Please Speak Slowly", "Please Say It Again" In Chinese?

"Can You Speak English?" means "你会说英语吗？" (ni hui shuo ying yu ma)
"I Can Only Speak a Little Chinese" means "我只会说一点汉语" (wo zhi hui shuo yi dian han yu).
"Please Speak Slowly" means "请说慢点." (qing shuo man dian)
and "Please Say It Again" means "请再说一遍." (qing zai shuo yi bian) in Chinese.

hope this helps.