I can liquefy you can liquefy he can liquefy we can liquefy you can liquefy they can liquefy
V-ing form
I can be liquefying you can be liquefying he can be liquefying we can be liquefying you can be liquefying they can be liquefying
Perfect
I can have liquefied you can have liquefied he can have liquefied we can have liquefied you can have liquefied they can have liquefied
V-ing perfect
I can have been liquefying you can have been liquefying he can have been liquefying we can have been liquefying you can have been liquefying they can have been liquefying
Negation
Simple form
I can't liquefy you can't liquefy he can't liquefy we can't liquefy you can't liquefy they can't liquefy
V-ing form
I can't be liquefying you can't be liquefying he can't be liquefying we can't be liquefying you can't be liquefying they can't be liquefying
Perfect
I can't have liquefied you can't have liquefied he can't have liquefied we can't have liquefied you can't have liquefied they can't have liquefied
V-ing perfect
I can't have been liquefying you can't have been liquefying he can't have been liquefying we can't have been liquefying you can't have been liquefying they can't have been liquefying
Interrogative form
Simple form
can I liquefy? can you liquefy? can he liquefy? can we liquefy? can you liquefy? can they liquefy?
V-ing form
can I be liquefying? can you be liquefying? can he be liquefying? can we be liquefying? can you be liquefying? can they be liquefying?
Perfect
can I have liquefied? can you have liquefied? can he have liquefied? can we have liquefied? can you have liquefied? can they have liquefied?
V-ing perfect
can I have been liquefying? can you have been liquefying? can he have been liquefying? can we have been liquefying? can you have been liquefying? can they have been liquefying?
Interro-negative form
Simple form
can't I liquefy? can't you liquefy? can't he liquefy? can't we liquefy? can't you liquefy? can't they liquefy?
V-ing form
can't I be liquefying? can't you be liquefying? can't he be liquefying? can't we be liquefying? can't you be liquefying? can't they be liquefying?
Perfect
can't I have liquefied? can't you have liquefied? can't he have liquefied? can't we have liquefied? can't you have liquefied? can't they have liquefied?
V-ing perfect
can't I have been liquefying? can't you have been liquefying? can't he have been liquefying? can't we have been liquefying? can't you have been liquefying? can't they have been liquefying?