shall thumbtack
Regular verb: thumbtack - thumbtacked- thumbtacked

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shall not thumbtack
you shall not thumbtack
she shall not thumbtack
we shall not thumbtack
you shall not thumbtack
they shall not thumbtack 	I shall not be thumbtacking
you shall not be thumbtacking
she shall not be thumbtacking
we shall not be thumbtacking
you shall not be thumbtacking
they shall not be thumbtacking	I shall not have thumbtacked
you shall not have thumbtacked
she shall not have thumbtacked
we shall not have thumbtacked
you shall not have thumbtacked
they shall not have thumbtacked	I shall not have been thumbtacking
you shall not have been thumbtacking
she shall not have been thumbtacking
we shall not have been thumbtacking
you shall not have been thumbtacking
they shall not 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 	
shall I not thumbtack?
shall you not thumbtack?
shall she not thumbtack?
shall we not thumbtack?
shall you not thumbtack?
shall they not thumbtack? 	shall I not be thumbtacking?
shall you not be thumbtacking?
shall she not be thumbtacking?
shall we not be thumbtacking?
shall you not be thumbtacking?
shall they not be thumbtacking? 	shall I not have thumbtacked?
shall you not have thumbtacked?
shall she not have thumbtacked?
shall we not have thumbtacked?
shall you not have thumbtacked?
shall they not have thumbtacked? 	shall I not have been thumbtacking?
shall you not have been thumbtacking?
shall she not have been thumbtacking?
shall we not have been thumbtacking?
shall you not have been thumbtacking?
shall they not have been thumbtacking?