Короче, одновременность - 1; следование - 2; предшествование - 3
They said that the surgeon had already operated the patient - 3
It was noticed that those drugs reduced the risk of reinfection - 1
The doctor said she had already made an order for the X-ray examination - 3
There was no evidence that the disease would spread - 2
She said that she wanted to be a dentist. - 1
We did not know whether the seed had been brought to the fields - 3
It was clear that they knew all the facts and were acting accordingly - 1
We thought about the mistake that he had made - 3
He said that he had been ill - 3
She said that her Father was ill - 1
The professor said that nobody had come to the lecture - 3
He prescribed me the drug that would relieve an acute pain - 2
I knew that researchers had found a new virus - 3
He told me that he would not smoke so much - 2
He stuck to the belief which had been found wrong - 3
... learned twenty words which I had found in the text - 3
I saw that the girl was very beautiful - 1.
Делается это так:
1 - если глаголы стоят в одном и том же времени (past simple тут, в основном)
2 - если придаточная часть содержит would
3 - если глагол стоит в past perfect (had found, had come и т.д.), что по сути обозначает предшествование.