Regular verb: whiten - whitened - whitened
Simple form | V-ing form |
I could whiten you could whiten she could whiten we could whiten you could whiten they could whiten | I could be whitening you could be whitening she could be whitening we could be whitening you could be whitening they could be whitening |
Perfect | V-ing perfect |
I could have whitened you could have whitened she could have whitened we could have whitened you could have whitened they could have whitened | I could have been whitening you could have been whitening she could have been whitening we could have been whitening you could have been whitening they could have been whitening |
Simple form | V-ing form |
I couldn't whiten you couldn't whiten she couldn't whiten we couldn't whiten you couldn't whiten they couldn't whiten | I couldn't be whitening you couldn't be whitening she couldn't be whitening we couldn't be whitening you couldn't be whitening they couldn't be whitening |
Perfect | V-ing perfect |
I couldn't have whitened you couldn't have whitened she couldn't have whitened we couldn't have whitened you couldn't have whitened they couldn't have whitened | I couldn't have been whitening you couldn't have been whitening she couldn't have been whitening we couldn't have been whitening you couldn't have been whitening they couldn't have been whitening |
Simple form | V-ing form |
could I whiten? could you whiten? could she whiten? could we whiten? could you whiten? could they whiten? | could I be whitening? could you be whitening? could she be whitening? could we be whitening? could you be whitening? could they be whitening? |
Perfect | V-ing perfect |
could I have whitened? could you have whitened? could she have whitened? could we have whitened? could you have whitened? could they have whitened? | could I have been whitening? could you have been whitening? could she have been whitening? could we have been whitening? could you have been whitening? could they have been whitening? |
Simple form | V-ing form |
couldn't I whiten? couldn't you whiten? couldn't she whiten? couldn't we whiten? couldn't you whiten? couldn't they whiten? | couldn't I be whitening? couldn't you be whitening? couldn't she be whitening? couldn't we be whitening? couldn't you be whitening? couldn't they be whitening? |
Perfect | V-ing perfect |
couldn't I have whitened? couldn't you have whitened? couldn't she have whitened? couldn't we have whitened? couldn't you have whitened? couldn't they have whitened? | couldn't I have been whitening? couldn't you have been whitening? couldn't she have been whitening? couldn't we have been whitening? couldn't you have been whitening? couldn't they have been whitening? |