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