is 是系动词lost做动词的话只能变成动名词losting，或者做名词lost；that引导从句，谓词do后缺成分；no need那need就是名词，she是主语的话中间也缺成分，下面是我改的，你可以 参考一下It is a lost of labor to do it that there is no need for her to keep a watchful eye on me.
