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 cannot liquefy you cannot liquefy he cannot liquefy we cannot liquefy you cannot liquefy they cannot liquefy
V-ing form
I cannot be liquefying you cannot be liquefying he cannot be liquefying we cannot be liquefying you cannot be liquefying they cannot be liquefying
Perfect
I cannot have liquefied you cannot have liquefied he cannot have liquefied we cannot have liquefied you cannot have liquefied they cannot have liquefied
V-ing perfect
I cannot have been liquefying you cannot have been liquefying he cannot have been liquefying we cannot have been liquefying you cannot have been liquefying they cannot 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 I not liquefy? can you not liquefy? can he not liquefy? can we not liquefy? can you not liquefy? can they not liquefy?
V-ing form
can I not be liquefying? can you not be liquefying? can he not be liquefying? can we not be liquefying? can you not be liquefying? can they not be liquefying?
Perfect
can I not have liquefied? can you not have liquefied? can he not have liquefied? can we not have liquefied? can you not have liquefied? can they not have liquefied?
V-ing perfect
can I not have been liquefying? can you not have been liquefying? can he not have been liquefying? can we not have been liquefying? can you not have been liquefying? can they not have been liquefying?