Back to: Interactive Grammar Refresher
Review the ICAO DOC 9835 Basic vs. Complex Tenses Classification:
| BASIC STRUCTURES | COMPLEX STRUCTURES |
| Present Simple I do |
Past Perfect I had done |
| Present Continuous I am doing |
Past Perfect Continuous I had been doing |
| Past Simple I did |
Present Continuous for Future I am doing |
| Past Continuous I was doing |
Future Continuous I will be doing |
| Present Perfect I have done |
Future Perfect (Continuous) I will have been (doing) |
| Present Perfect Continuous I have been doing |
Future in Past Tenses was going to, etc. |
| Future Simple Will (+ Going to) |