1) I drink a delicious cocktail

I drank a delicious cocktail now

I have drunk delicious cocktail

2) I know this topic 

I knew this topic before

I have known this topic

3) I sign this song 

I sang this song in the fifth grade

I have sung this song 

4) My brother wins the running competition.

My brother won the running competition in 2018.

My brother  won the running competition.

5) We go to the store every week

Yesterday we went to the store

We have gone to the store.