I have been working at GF for 5 years. I have worked at GF for 5 years.   - We choose Pr Perfect and Present Perfect continuous depending what we want to emphasize - duration or result. , I'll clean the plates when you have finished eating. - With words that indicate condition of time (if, when, until, by the time) use Present Perf instead of Future Perf , He seems to have left - We use Perfect Infinitive (to have done) to show the sequence of events. , I hope to have earned my first million until I am 30.  - We use Perfect Infinitive (to have done) to emphasize the result before deadline in the future, I was accused of having kidnapped a cat. - Perfect Gerund (having + V3) is used to emphasize the sequence of events. Action in gerund happened before. ,

Advanced Grammar Class 1 Grammar rules_2

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