| Example |
Tense |
| I can do it nowadays. |
Present |
| I could do it before, but not anymore. |
Past |
| I was able to do it before, but not anymore. |
Past |
| I have been able to do it for years now. |
Present Perfect |
| I had been able to do it long before you learned it. |
Past Perfect |
| I will be able to do it in a year. |
Future |