present perfect simple: Rule: Use .... to look back from now to a time before now, I've been here since I was a boy, Present perfect continuous: rule: use ... to focus on the length of time an action takes (present), She's been waiting for her burger for an hour., Past Perfect simple: rule: use the ... to look back from a time in the past to a time before that, I had to go back because I'd left my wallet there, Past Perfect continuous : rule: use ... to focus on the length of time an action takes (past), She'd been doing that job for fifteen years, Future perfect simple: Rule: Use .... to look back from a time in the future to a time before that, By next week, I will have finished this project, Future perfect continuous: rule: use ... to focus on the length of time an action takes (future)), In 2022, I'll have been living in Italy for 3 years,

Teens Speakout c1 unit 4.2 perfect aspect

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