which preposition is correct?

[Rock Girl]

Hi guys,
I have a question.
If I want to talk about "thinking about something that happened in the past", can I use the verb "look back"?
What's its preposition? "on" or "to"?

For example, which one is correct?
A: I look back on a year ago when...
B: I look back to a year ago when...

Thanks in advance,

[5jj]

Both are possible. For me, there is a difference, but this may be just personal.

If I look back on a period of my life, I think about it, re-create it in my mind.
If I look back to a certain period, I focus my attention on it, and perhaps pick out some things to think about.

[Rock Girl]

thanks a lot

[billmcd]

Hi guys,
I have a question.
If I want to talk about "thinking about something that happened in the past", can I use the verb "look back"?
What's its preposition? "on" or "to"?

For example, which one is correct?
A: I look back on a year ago when...
B: I look back to a year ago when...

Thanks in advance,

Perhaps a slight difference for me: "on a year ago" = a period of time as in the entire year; "to a year ago" = a year ago from the time of speaking. Depends what follows "when".

[Rock Girl]

Perhaps a slight difference for me: "on a year ago" = a period of time as in the entire year; "to a year ago" = a year ago from the time of speaking. Depends what follows "when".

Thank you so much. I got it.