たら、-た
Usage
Vたら、(N/A)た
Indicates that Y happened as a result of an action X
Can indicate Y was discovered as a result of an action X
Examples
薬を飲んだら、元気になりました。
I felt better after I had taken the medicine.
カーテンを変えたら、部屋が明るくなった。
The room became brighter after I changed the curtains.
かえに帰ったら、猫がいなかった。
After getting home, I noticed the cat wasn't there.