These can be divided into completed and incomplete events.

There are also a number of adverbs and adjectives that are associated with its uses.

Completed events

1.   To refer to previous experiences without a specific time.

• "Have we met? You look familiar."

Not - "Have we met yesterday?"

• "We've tried the steak here. It's really good."

Not - "We've tried the steak here last weekend."

+   General ("indefinite") time expressions like "never," "ever," "before," "so far," "until now," etc.

• "Have you ever eaten kangaroo meat before?"

• "She's never seen Star Wars until now. Can you believe it?"

+   Ordinals - to express how many times we have had this experience.

• "This is the first time I've driven a car."

• "It's the third time he's visited Tasmania."

+   Superlative adjectives - to describe unique experiences.

• "He said it was the most profound experience he's ever had."

• "It was the worst movie I've ever seen."

+   "Since" - if you want to give a specific time.

• "We've tried the steak here since they hired a new chef last month. It's really good."

• "He's been on a date once since his breakup two years ago."

2.   To talk about recently completed events.

• "Wally has returned from a business trip."

+   "Just" & "Recently" - to express how recent this happened and distinguish this from the previous use about past experiences.

• "They've just arrived from the airport."

• "Our company has recently opened another office in Tasmania."

+   "Already" - to emphasise that something is done.

• "I've already taken a bath."

• "The children have already had their dinner."

3.   To talk about past events with present results.

This is very similar to the previous use but this refers to recent events that has an impact on the present.

• "He's broken his leg so he can't play with us this weekend."

• "There's been an accident on the highway."