Emma didn’t know what to say at the moment.(改为含有宾语从句的句子)

Emma didn’t know what to say at the moment.(改为含有宾语从句的句子)
Emma didn’t know what to say at the moment.(改为含有宾语从句的句子)

Emma didn’t know what to say at the moment.(改为含有宾语从句的句子)
Emma didn't know what she should say at the moment.

Emma didn't know what is the word to be said at the moment.

Emma didn't know the words which should be said at the moment
the words是宾语,
which接的是宾语从句

Emma didn't know that what she should say at the moment.