I can melt you can melt he can melt we can melt you can melt they can melt
V-ing form
I can be melting you can be melting he can be melting we can be melting you can be melting they can be melting
Perfect
I can have melted you can have melted he can have melted we can have melted you can have melted they can have melted
V-ing perfect
I can have been melting you can have been melting he can have been melting we can have been melting you can have been melting they can have been melting
Negation
Simple form
I cannot melt you cannot melt he cannot melt we cannot melt you cannot melt they cannot melt
V-ing form
I cannot be melting you cannot be melting he cannot be melting we cannot be melting you cannot be melting they cannot be melting
Perfect
I cannot have melted you cannot have melted he cannot have melted we cannot have melted you cannot have melted they cannot have melted
V-ing perfect
I cannot have been melting you cannot have been melting he cannot have been melting we cannot have been melting you cannot have been melting they cannot have been melting
Interrogative form
Simple form
can I melt? can you melt? can he melt? can we melt? can you melt? can they melt?
V-ing form
can I be melting? can you be melting? can he be melting? can we be melting? can you be melting? can they be melting?
Perfect
can I have melted? can you have melted? can he have melted? can we have melted? can you have melted? can they have melted?
V-ing perfect
can I have been melting? can you have been melting? can he have been melting? can we have been melting? can you have been melting? can they have been melting?
Interro-negative form
Simple form
can I not melt? can you not melt? can he not melt? can we not melt? can you not melt? can they not melt?
V-ing form
can I not be melting? can you not be melting? can he not be melting? can we not be melting? can you not be melting? can they not be melting?
Perfect
can I not have melted? can you not have melted? can he not have melted? can we not have melted? can you not have melted? can they not have melted?
V-ing perfect
can I not have been melting? can you not have been melting? can he not have been melting? can we not have been melting? can you not have been melting? can they not have been melting?