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 can't melt you can't melt he can't melt we can't melt you can't melt they can't melt
V-ing form
I can't be melting you can't be melting he can't be melting we can't be melting you can't be melting they can't be melting
Perfect
I can't have melted you can't have melted he can't have melted we can't have melted you can't have melted they can't have melted
V-ing perfect
I can't have been melting you can't have been melting he can't have been melting we can't have been melting you can't have been melting they can't 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't I melt? can't you melt? can't he melt? can't we melt? can't you melt? can't they melt?
V-ing form
can't I be melting? can't you be melting? can't he be melting? can't we be melting? can't you be melting? can't they be melting?
Perfect
can't I have melted? can't you have melted? can't he have melted? can't we have melted? can't you have melted? can't they have melted?
V-ing perfect
can't I have been melting? can't you have been melting? can't he have been melting? can't we have been melting? can't you have been melting? can't they have been melting?