Wo Xiang gen nin yi ge xing qi xue xi San ci .我想跟您一个星期学习三次。

I am not native Chinese so no 100% guarantee. :)

wo3 xiang3 he2 ni3 mei3 zhou1 xue2 xi2 san1 ci4 wo3 I xiang3 want to xue2 xi2 study he2 ni3 with you san1 ci4 3 times mei3 zhou1 a week

wo3 xiang3 he2 ni3 yi4 qi3 yi4 zhou1 xue2 xi2 san1 ci4.