I could moisten you could moisten he could moisten we could moisten you could moisten they could moisten
V-ing form
I could be moistening you could be moistening he could be moistening we could be moistening you could be moistening they could be moistening
Perfect
I could have moistened you could have moistened he could have moistened we could have moistened you could have moistened they could have moistened
V-ing perfect
I could have been moistening you could have been moistening he could have been moistening we could have been moistening you could have been moistening they could have been moistening
Negation
Simple form
I couldn't moisten you couldn't moisten he couldn't moisten we couldn't moisten you couldn't moisten they couldn't moisten
V-ing form
I couldn't be moistening you couldn't be moistening he couldn't be moistening we couldn't be moistening you couldn't be moistening they couldn't be moistening
Perfect
I couldn't have moistened you couldn't have moistened he couldn't have moistened we couldn't have moistened you couldn't have moistened they couldn't have moistened
V-ing perfect
I couldn't have been moistening you couldn't have been moistening he couldn't have been moistening we couldn't have been moistening you couldn't have been moistening they couldn't have been moistening
Interrogative form
Simple form
could I moisten? could you moisten? could he moisten? could we moisten? could you moisten? could they moisten?
V-ing form
could I be moistening? could you be moistening? could he be moistening? could we be moistening? could you be moistening? could they be moistening?
Perfect
could I have moistened? could you have moistened? could he have moistened? could we have moistened? could you have moistened? could they have moistened?
V-ing perfect
could I have been moistening? could you have been moistening? could he have been moistening? could we have been moistening? could you have been moistening? could they have been moistening?
Interro-negative form
Simple form
couldn't I moisten? couldn't you moisten? couldn't he moisten? couldn't we moisten? couldn't you moisten? couldn't they moisten?
V-ing form
couldn't I be moistening? couldn't you be moistening? couldn't he be moistening? couldn't we be moistening? couldn't you be moistening? couldn't they be moistening?
Perfect
couldn't I have moistened? couldn't you have moistened? couldn't he have moistened? couldn't we have moistened? couldn't you have moistened? couldn't they have moistened?
V-ing perfect
couldn't I have been moistening? couldn't you have been moistening? couldn't he have been moistening? couldn't we have been moistening? couldn't you have been moistening? couldn't they have been moistening?