then, at that time
= Last Wednesday
Walang mansanas noon sa Pilipinas.
There were no apples in the Philippines then.
Kobe was my neighbor at some time in the past.
that’s when I saw Ana
Nagulat akong noong nakita kita.
I was shocked when I saw you.
Natatandaan mo pa nung magkaklase tayo?
Do you still remember when we were classmates?
even when, even then
Noon pa man ay mahal ko na siya.
Even back then I already loved him/her.
The English word “noon” (twelve o’clock) is tanghali in Tagalog.