Regular verb: modify - modified - modified
Simple form | V-ing form |
I could modify you could modify he could modify we could modify you could modify they could modify | I could be modifying you could be modifying he could be modifying we could be modifying you could be modifying they could be modifying |
Perfect | V-ing perfect |
I could have modified you could have modified he could have modified we could have modified you could have modified they could have modified | I could have been modifying you could have been modifying he could have been modifying we could have been modifying you could have been modifying they could have been modifying |
Simple form | V-ing form |
I couldn't modify you couldn't modify he couldn't modify we couldn't modify you couldn't modify they couldn't modify | I couldn't be modifying you couldn't be modifying he couldn't be modifying we couldn't be modifying you couldn't be modifying they couldn't be modifying |
Perfect | V-ing perfect |
I couldn't have modified you couldn't have modified he couldn't have modified we couldn't have modified you couldn't have modified they couldn't have modified | I couldn't have been modifying you couldn't have been modifying he couldn't have been modifying we couldn't have been modifying you couldn't have been modifying they couldn't have been modifying |
Simple form | V-ing form |
could I modify? could you modify? could he modify? could we modify? could you modify? could they modify? | could I be modifying? could you be modifying? could he be modifying? could we be modifying? could you be modifying? could they be modifying? |
Perfect | V-ing perfect |
could I have modified? could you have modified? could he have modified? could we have modified? could you have modified? could they have modified? | could I have been modifying? could you have been modifying? could he have been modifying? could we have been modifying? could you have been modifying? could they have been modifying? |
Simple form | V-ing form |
couldn't I modify? couldn't you modify? couldn't he modify? couldn't we modify? couldn't you modify? couldn't they modify? | couldn't I be modifying? couldn't you be modifying? couldn't he be modifying? couldn't we be modifying? couldn't you be modifying? couldn't they be modifying? |
Perfect | V-ing perfect |
couldn't I have modified? couldn't you have modified? couldn't he have modified? couldn't we have modified? couldn't you have modified? couldn't they have modified? | couldn't I have been modifying? couldn't you have been modifying? couldn't he have been modifying? couldn't we have been modifying? couldn't you have been modifying? couldn't they have been modifying? |