Regular verb: rain - rained - rained
Simple form | V-ing form |
- - it must rain - - - | - - it must be raining - - - |
Perfect | V-ing perfect |
- - it must have rained - - - | - - it must have been raining - - - |
Simple form | V-ing form |
- - it must not rain - - - | - - it must not be raining - - - |
Perfect | V-ing perfect |
- - it must not have rained - - - | - - it must not have been raining - - - |
Simple form | V-ing form |
- - must it rain? - - - | - - must it be raining? - - - |
Perfect | V-ing perfect |
- - must it have rained? - - - | - - must it have been raining? - - - |
Simple form | V-ing form |
- - must it not rain? - - - | - - must it not be raining? - - - |
Perfect | V-ing perfect |
- - must it not have rained? - - - | - - must it not have been raining? - - - |