I may forestall you may forestall he may forestall we may forestall you may forestall they may forestall
V-ing form
I may be forestalling you may be forestalling he may be forestalling we may be forestalling you may be forestalling they may be forestalling
Perfect
I may have forestalled you may have forestalled he may have forestalled we may have forestalled you may have forestalled they may have forestalled
V-ing perfect
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
I may not forestall you may not forestall he may not forestall we may not forestall you may not forestall they may not forestall
V-ing form
I may not be forestalling you may not be forestalling he may not be forestalling we may not be forestalling you may not be forestalling they may not be forestalling
Perfect
I may not have forestalled you may not have forestalled he may not have forestalled we may not have forestalled you may not have forestalled they may not have forestalled
V-ing perfect
I may not have been forestalling you may not have been forestalling he may not have been forestalling we may not have been forestalling you may not have been forestalling they may not have been forestalling
Interrogative form
Simple form
may I forestall? may you forestall? may he forestall? may we forestall? may you forestall? may they forestall?
V-ing form
may I be forestalling? may you be forestalling? may he be forestalling? may we be forestalling? may you be forestalling? may they be forestalling?
Perfect
may I have forestalled? may you have forestalled? may he have forestalled? may we have forestalled? may you have forestalled? may they have forestalled?
V-ing perfect
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
may I not forestall? may you not forestall? may he not forestall? may we not forestall? may you not forestall? may they not forestall?
V-ing form
may I not be forestalling? may you not be forestalling? may he not be forestalling? may we not be forestalling? may you not be forestalling? may they not be forestalling?
Perfect
may I not have forestalled? may you not have forestalled? may he not have forestalled? may we not have forestalled? may you not have forestalled? may they not have forestalled?
V-ing perfect
may I not have been forestalling? may you not have been forestalling? may he not have been forestalling? may we not have been forestalling? may you not have been forestalling? may they not have been forestalling?