[F2英文][Reported Speech]求解[20點]

Indirect (=Reported) Speech which gives the exact meaning of the speech has Tense changes in reported speech.No change with the tense of verb in indirect (=reported) speech when the introductory verb is in the present tense.Direct Speech changes to Reported Speech past tense. Note that simple present tense -----> simple past tense.and that simple past tense------>past perfect tense.
Direct:-Mrs. Lau : I do not know who killed Dr Koo.
Indirect:-Mrs. Lau said that she did not know who had killed Dr. Koo.
(according to present tense----->past tense ;ie:-do---->did)
(according to past tense---->past perfect tense;ie:-killed ---->had killed)
Some of the above changes can and should be verified yourself.

2014-01-05 13:52:31 補充：
Re:-She was innocent on (passive past) who killed (active past) Dr.Koo.
did know--->didn't know--->active past--->passive past=was innocent=didn't know(Not change to had done.)
Also active past=who killed.
Should tryverify yourself.

Mrs Lau said that she did not know who had killed Dr.Koo.

Mrs Lau denied knowing who had killed Dr Koo.
Mrs Lau denied knowing earlier who had killed Dr Koo.

Mrs Lau doesn't know who killed Dr. Koo.
Can you change this sentence into reported speech?
Direct narration==Mrs Lau said,"I doesn't know who killed Dr. Koo".
Indirect nattation==Mrs.Lau said that she didn't know who killed Dr. Koo.

Answer:
Mrs Lau said that she did not know who had killed Dr.Koo.

It could be

Mrs Lau remarked that she didn't know who had killed Dr. Koo.