The mummy is that of Shepenmut who was once a singer.这里如果不用t

The mummy is that of Shepenmut who was once a singer.这里如果不用that,可不可以is of这样用,

The mummy is that of Shepenmut who was once a singer.这具木乃伊是Shepenmut（赛潘姆特）的,她曾经是底比斯（埃及尼罗河畔的古城）庙的一个歌手.
这里不能用is of Shepenmut的表达.
that of Shepenmut who was once a singer.是一个表语从句.
再问： 那用了is of变成什么意思了，
再答： 一、"(be)+of表达的意义： 1. "(be)+of+名词"结构中的名词是抽象名词时,相当于其中名词所对应的形容词的意思,说明被修饰词具有某种特征或属性。常用的名词有use/importance/help/value/interest/quality/service/benefit/necessity等。如: 2. "(be)+of +名词"结构中的名词表种类、数量、度量等时,表示不同的人或物的共同特征,此时名词前通常带有冠词。常用的名词有size/kind/type/price/height/depth/width/length/weight/age/shape/colour等。如: We are of the same age. 我们同岁。 The twin sisters are of a size and the skirt fits each of them exactly. 双胞胎姐妹的身材一样,这件裙子两个人穿都非常合适。 Machines are of different types and sizes.机器有不同的型号和规格。 3. "(be)+of+名词"结构可以表示主语的根源关系,此时的名词多是表示亲属、血统、种族、国籍及出处的名词,常用的名词有family/blood/race/origin等。如: We are of the same blood. 我们是同一家族。 They are of noble race. 他们出身名门。 二、"(be)+of所作的成分 1. 作表语。如: Don't throw anything that may be of use.不要把任何有用的东西扔掉。(=Don't throw anything that may be useful.) Flowers are of many colours. 花的颜色很多。 注意: of high quality在所给课文句子(New Zealand wine is of high quality and is sold all over the world.)中也作表语。句意是:新西兰葡萄酒质量很高,行销全世界。 2. 作定语。如: Your sister is a girl of wisdom. 你妹妹是一位有智慧的女孩。(=Your sister is a wise girl.) We don't think there is anything of interest in your pictures. 我们认为你的画并没有什么有趣的地方。(=We don't think there is anything interesting in your pictures.) 3. 宾语补足语。如: He found himself of absolutely contradictory points of view. 他发现自己处于完全矛盾的观点之中。 综上所述,"(be)+of+名词"相当于形容词,在句中可以作表语、定语或宾语补足语。