in 1945 when...

Hello.

Which of the following is acceptable?
#1 World War II was over in 1945 when my mother was born.
#2 World War II was over in 1945, when my mother was born.
#3 World War II was over in the year when my mother was born.

I think #2 and 3 are acceptable, but I’m not sure about #1.
Could you also explain why some of these are acceptable and others not?

Thanks in advance!

#1 is not acceptable because ‘1945’ is already definite; it should not be followed therefore by a defining clause. The others are OK, except that ‘was over’ is the wrong verb choice, since the war was not over in January-July 1945. Replace ‘WW II was over’ with ‘WW II ended’.

I guess I can say “Word War II ended in 1945 in which year my mother was born”. Am I right?

No, not without a comma after ‘1945’ – but even then ‘in which year’ makes the sentence quite stilted.

Got it, Thank you, Sir.

I don’t understand the difference between be over and end. Could you explain more?

‘Be over’ is a durational condition; ‘end’ is a point event.

Could you give me some examples for each?

Try googling or use COCA: corpus.byu.edu/

Thank you master for kindly helping me.