The girl who likes music is from America.(对The girl划线提问) 可以变成Who who likes music is from America?吗 Tim is talking to Liu Chang who is writing an e-mail. (对Liu Chang划线提问) 可以变成Who who is writing an e-mail is Tim talking to ?吗 谢谢
the museum was built in 1982 which/that some germen friends visited last sunday. 关系代词有三个作用:连接作用、替代作用、成分作用。 这个句子的先行词是the museum,是物,可从后面的句子看出 the museum做宾语,所以用关系代词which或者that来替代。 用了先行代词,替代了定语从句中的it,所以it就要去掉。