| Gerund |
observing
|
| Present simple (ott) |
I observe you observe he observes we observe you observe they observe
|
| Present perfect (vtt) |
I have observed you have observed he has observed we have observed you have observed they have observed
|
| Past Simple (ovt) |
I observed you observed he observed we observed you observed they observed
|
| Past perfect (vvt) |
I had observed you had observed he had observed we had observed you had observed they had observed
|
| Present future (ottt) |
I will observe you will observe he will observe we will observe you will observe they will observe
|
| Present future perfect (vttt) |
I will have observed you will have observed he will have observed we will have observed you will have observed they will have observed
|
| Past future (ovtt) |
I would observe you would observe he would observe we would observe you would observe they would observe
|
| Past future perfect (vvtt) |
I would have observed you would have observed he would have observed we would have observed you would have observed they would have observed
|