I could speak little English.或I could speak few English words.
(上两句都译为:我只会讲一点英语(单词)。)
I know little English.或I know few English words.
(上两句都译为:我只会一点英语。)
注意:楼主在使用以上句子的时候,最好不要加only,因为根据英语的语法规则,only后加的一些(a few/few/a little/little) 都必须有a,即only few、only little是有语法错误的,应写为only a few/only a little