—How do you know that she likes singing?

—How do you know that she likes singing? How do you know that she likes singing?I often hear How do you konw that she likes singing?I often hear her＿＿＿（s do you know how old she is Do you like singing?Do you know how to use the iPod or iPhon Do you know what does she likes?哪里错了 为什么不是Why do you know that,而是How do you know that :How do I let you know that you are my 英语选 Jack do you know the girl singing yes.she is LUCK my cla How do you know? do you know how() how do you know