Say that you have had an experience.
The rule
Short past shape verb + ことがあります. This describes an experiment, without necessarily specifying when it took place.
Examples
日本に行ったことがあります。
I've already been to Japan.
Remember
- た + ことがあります Word: Experience already lived.
- The negative form たことがありません means "have never done it".
In everyday life
日本に行ったことがあります。
I've already been to Japan.
納豆を食べたことがありません。
I've never eaten nattō before.
Common mistake
For a precise action yesterday, simply use the past: 昨日行きました.