may forestall
Regular verb: forestall - forestalled- forestalled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may forestall
you may forestall
he may forestall
we may forestall
you may forestall
they may forestall 	I may be forestalling
you may be forestalling
he may be forestalling
we may be forestalling
you may be forestalling
they may be forestalling	I may have forestalled
you may have forestalled
he may have forestalled
we may have forestalled
you may have forestalled
they may have forestalled	I may have been forestalling
you may have been forestalling
he may have been forestalling
we may have been forestalling
you may have been forestalling
they may have been forestalling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't forestall
you mayn't forestall
he mayn't forestall
we mayn't forestall
you mayn't forestall
they mayn't forestall 	I mayn't be forestalling
you mayn't be forestalling
he mayn't be forestalling
we mayn't be forestalling
you mayn't be forestalling
they mayn't be forestalling	I mayn't have forestalled
you mayn't have forestalled
he mayn't have forestalled
we mayn't have forestalled
you mayn't have forestalled
they mayn't have forestalled	I mayn't have been forestalling
you mayn't have been forestalling
he mayn't have been forestalling
we mayn't have been forestalling
you mayn't have been forestalling
they mayn't have been forestalling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I forestall?
may you forestall?
may he forestall?
may we forestall?
may you forestall?
may they forestall? 	may I be forestalling?
may you be forestalling?
may he be forestalling?
may we be forestalling?
may you be forestalling?
may they be forestalling? 	may I have forestalled?
may you have forestalled?
may he have forestalled?
may we have forestalled?
may you have forestalled?
may they have forestalled? 	may I have been forestalling?
may you have been forestalling?
may he have been forestalling?
may we have been forestalling?
may you have been forestalling?
may they have been forestalling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I forestall?
mayn't you forestall?
mayn't he forestall?
mayn't we forestall?
mayn't you forestall?
mayn't they forestall? 	mayn't I be forestalling?
mayn't you be forestalling?
mayn't he be forestalling?
mayn't we be forestalling?
mayn't you be forestalling?
mayn't they be forestalling? 	mayn't I have forestalled?
mayn't you have forestalled?
mayn't he have forestalled?
mayn't we have forestalled?
mayn't you have forestalled?
mayn't they have forestalled? 	mayn't I have been forestalling?
mayn't you have been forestalling?
mayn't he have been forestalling?
mayn't we have been forestalling?
mayn't you have been forestalling?
mayn't they have been forestalling?