may whistle
Regular verb: whistle - whistled- whistled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may whistle
you may whistle
he may whistle
we may whistle
you may whistle
they may whistle 	I may be whistling
you may be whistling
he may be whistling
we may be whistling
you may be whistling
they may be whistling	I may have whistled
you may have whistled
he may have whistled
we may have whistled
you may have whistled
they may have whistled	I may have been whistling
you may have been whistling
he may have been whistling
we may have been whistling
you may have been whistling
they may have been whistling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't whistle
you mayn't whistle
he mayn't whistle
we mayn't whistle
you mayn't whistle
they mayn't whistle 	I mayn't be whistling
you mayn't be whistling
he mayn't be whistling
we mayn't be whistling
you mayn't be whistling
they mayn't be whistling	I mayn't have whistled
you mayn't have whistled
he mayn't have whistled
we mayn't have whistled
you mayn't have whistled
they mayn't have whistled	I mayn't have been whistling
you mayn't have been whistling
he mayn't have been whistling
we mayn't have been whistling
you mayn't have been whistling
they mayn't have been whistling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I whistle?
may you whistle?
may he whistle?
may we whistle?
may you whistle?
may they whistle? 	may I be whistling?
may you be whistling?
may he be whistling?
may we be whistling?
may you be whistling?
may they be whistling? 	may I have whistled?
may you have whistled?
may he have whistled?
may we have whistled?
may you have whistled?
may they have whistled? 	may I have been whistling?
may you have been whistling?
may he have been whistling?
may we have been whistling?
may you have been whistling?
may they have been whistling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I whistle?
mayn't you whistle?
mayn't he whistle?
mayn't we whistle?
mayn't you whistle?
mayn't they whistle? 	mayn't I be whistling?
mayn't you be whistling?
mayn't he be whistling?
mayn't we be whistling?
mayn't you be whistling?
mayn't they be whistling? 	mayn't I have whistled?
mayn't you have whistled?
mayn't he have whistled?
mayn't we have whistled?
mayn't you have whistled?
mayn't they have whistled? 	mayn't I have been whistling?
mayn't you have been whistling?
mayn't he have been whistling?
mayn't we have been whistling?
mayn't you have been whistling?
mayn't they have been whistling?