shall thumbtack
Regular verb: thumbtack - thumbtacked- thumbtacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'll thumbtack
you'll thumbtack
she'll thumbtack
we'll thumbtack
you'll thumbtack
they'll thumbtack 	I'll be thumbtacking
you'll be thumbtacking
she'll be thumbtacking
we'll be thumbtacking
you'll be thumbtacking
they'll be thumbtacking	I'll have thumbtacked
you'll have thumbtacked
she'll have thumbtacked
we'll have thumbtacked
you'll have thumbtacked
they'll have thumbtacked	I'll have been thumbtacking
you'll have been thumbtacking
she'll have been thumbtacking
we'll have been thumbtacking
you'll have been thumbtacking
they'll have been thumbtacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shan't thumbtack
you shan't thumbtack
she shan't thumbtack
we shan't thumbtack
you shan't thumbtack
they shan't thumbtack 	I shan't be thumbtacking
you shan't be thumbtacking
she shan't be thumbtacking
we shan't be thumbtacking
you shan't be thumbtacking
they shan't be thumbtacking	I shan't have thumbtacked
you shan't have thumbtacked
she shan't have thumbtacked
we shan't have thumbtacked
you shan't have thumbtacked
they shan't have thumbtacked	I shan't have been thumbtacking
you shan't have been thumbtacking
she shan't have been thumbtacking
we shan't have been thumbtacking
you shan't have been thumbtacking
they shan't have been thumbtacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shall I thumbtack?
shall you thumbtack?
shall she thumbtack?
shall we thumbtack?
shall you thumbtack?
shall they thumbtack? 	shall I be thumbtacking?
shall you be thumbtacking?
shall she be thumbtacking?
shall we be thumbtacking?
shall you be thumbtacking?
shall they be thumbtacking? 	shall I have thumbtacked?
shall you have thumbtacked?
shall she have thumbtacked?
shall we have thumbtacked?
shall you have thumbtacked?
shall they have thumbtacked? 	shall I have been thumbtacking?
shall you have been thumbtacking?
shall she have been thumbtacking?
shall we have been thumbtacking?
shall you have been thumbtacking?
shall they have been thumbtacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shan't I thumbtack?
shan't you thumbtack?
shan't she thumbtack?
shan't we thumbtack?
shan't you thumbtack?
shan't they thumbtack? 	shan't I be thumbtacking?
shan't you be thumbtacking?
shan't she be thumbtacking?
shan't we be thumbtacking?
shan't you be thumbtacking?
shan't they be thumbtacking? 	shan't I have thumbtacked?
shan't you have thumbtacked?
shan't she have thumbtacked?
shan't we have thumbtacked?
shan't you have thumbtacked?
shan't they have thumbtacked? 	shan't I have been thumbtacking?
shan't you have been thumbtacking?
shan't she have been thumbtacking?
shan't we have been thumbtacking?
shan't you have been thumbtacking?
shan't they have been thumbtacking?