误：I don't still understand what you mean.

　　正：I still don't understand what you mean.

　　析：still 用于否定句时，应放在 don't, haven't, didn't 等否定词之前。又如：

　　He still doesn't understand. 他仍然不懂。

　　The breakfast I ordered still hasn't arrived. 我要的早餐还没有来。

　　I still haven't heard from her. 我还是没有听到她的消息。

　　When I came back at midnight she still hadn't finished. 我半夜回来时，他还没有做完。

　　I've been waiting for an hour and he still hasn't turned up. 我等了一小时了，可他还没来。

　　I still haven't thanked Aunt Lucy for her present. 对露茜姑姑送的礼物我还没有表示感谢呢。

　　I've been married to you for sixteen years and I still don't understand you. 我和你结婚16年了，可我对你仍然不了解。

　　注：有时 still 也可放在助动词与否定词(not)之间，但较少见，如：

　　A solution still hasn't been found. / A solution has still not been found. 还没有找到解决的办法)，

　　但是不能说：A solution hasn't still been found.