may descale
Regular verb: descale - descaled- descaled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may descale
you may descale
he may descale
we may descale
you may descale
they may descale 	I may be descaling
you may be descaling
he may be descaling
we may be descaling
you may be descaling
they may be descaling	I may have descaled
you may have descaled
he may have descaled
we may have descaled
you may have descaled
they may have descaled	I may have been descaling
you may have been descaling
he may have been descaling
we may have been descaling
you may have been descaling
they may have been descaling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't descale
you mayn't descale
he mayn't descale
we mayn't descale
you mayn't descale
they mayn't descale 	I mayn't be descaling
you mayn't be descaling
he mayn't be descaling
we mayn't be descaling
you mayn't be descaling
they mayn't be descaling	I mayn't have descaled
you mayn't have descaled
he mayn't have descaled
we mayn't have descaled
you mayn't have descaled
they mayn't have descaled	I mayn't have been descaling
you mayn't have been descaling
he mayn't have been descaling
we mayn't have been descaling
you mayn't have been descaling
they mayn't have been descaling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I descale?
may you descale?
may he descale?
may we descale?
may you descale?
may they descale? 	may I be descaling?
may you be descaling?
may he be descaling?
may we be descaling?
may you be descaling?
may they be descaling? 	may I have descaled?
may you have descaled?
may he have descaled?
may we have descaled?
may you have descaled?
may they have descaled? 	may I have been descaling?
may you have been descaling?
may he have been descaling?
may we have been descaling?
may you have been descaling?
may they have been descaling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I descale?
mayn't you descale?
mayn't he descale?
mayn't we descale?
mayn't you descale?
mayn't they descale? 	mayn't I be descaling?
mayn't you be descaling?
mayn't he be descaling?
mayn't we be descaling?
mayn't you be descaling?
mayn't they be descaling? 	mayn't I have descaled?
mayn't you have descaled?
mayn't he have descaled?
mayn't we have descaled?
mayn't you have descaled?
mayn't they have descaled? 	mayn't I have been descaling?
mayn't you have been descaling?
mayn't he have been descaling?
mayn't we have been descaling?
mayn't you have been descaling?
mayn't they have been descaling?