| Present "obstruct" | I | obstruct | |
| Present Continuous "obstruct" | I | am obstructing | |
| Simple past "obstruct" | I | obstructed | |
| Past Continuous "obstruct" | I | was obstructing | |
| Present perfect "obstruct" | I | have obstructed | |
| Present perfect continuous "obstruct" | I | have been obstructing | |
| Past perfect "obstruct" | I | had obstructed | |
| Past perfect continuous "obstruct" | I | had been obstructing | |
| Future "obstruct" | I | will obstruct | |
| Future continuous "obstruct" | I | will be obstructing | |
| Future perfect "obstruct" | I | will have obstructed | |
| Future perfect continuous "obstruct" | I | will have been obstructing |