please tell me differences .

[liuchunsheng123456]

could you tell me if these sentenses have the same meaning ?

That was why he was so sad .
That was the reason why he was so sad .
That was the reason that he was so sad .

I know that these two sentences don't have the same meaning .
That was why he was so sad .
The reason is that he was sad .

How about the first three ? I'm confused .

[Rusty]

could you tell me if these sentenses have the same meaning ?

That was why he was so sad .
That was the reason why he was so sad .
That was the reason that he was so sad .

I know that these two sentences don't have the same meaning .
That was why he was so sad .
The reason is that he was sad .

How about the first three ? I'm confused .
The first three sentences have the same meaning.
"That" refers to the cause of his sadness.
Sentence (5) means: His sadness is the reason why something did/didn't happen.

[liuchunsheng123456]

please look at these sentences below:

He had joined the Titanic on her first voyage to discover if there were any problems . And now the problem was whether she was fit to travel !That was why he was so sad .
Captain Smith did not leave the ship , either . That was because he was ashamed of himself .

could you tell me more about the differences between the two sentences above ?

[Rusty]

please look at these sentences below:

He had joined the Titanic on her first voyage to discover if there were any problems . And now the problem was whether she was fit to travel !That was why he was so sad .
Captain Smith did not leave the ship , either . That was because he was ashamed of himself .

could you tell me more about the differences between the two sentences above ?
1) "That" refers to "problem." The problem made him sad.
2) "That" refers to "Captain Smith did not leave the ship."
He did not leave the ship because he was ashamed of himself.

[liuchunsheng123456]

Thank you very much .