English verb conjugation
COULD UMPIRE

Regular verb: umpire - umpired - umpired

Affirmation

Simple form	V-ing form
I could umpire you could umpire he could umpire we could umpire you could umpire they could umpire	I could be umpiring you could be umpiring he could be umpiring we could be umpiring you could be umpiring they could be umpiring
Perfect	V-ing perfect
I could have umpired you could have umpired he could have umpired we could have umpired you could have umpired they could have umpired	I could have been umpiring you could have been umpiring he could have been umpiring we could have been umpiring you could have been umpiring they could have been umpiring

Negation

Simple form	V-ing form
I couldn't umpire you couldn't umpire he couldn't umpire we couldn't umpire you couldn't umpire they couldn't umpire	I couldn't be umpiring you couldn't be umpiring he couldn't be umpiring we couldn't be umpiring you couldn't be umpiring they couldn't be umpiring
Perfect	V-ing perfect
I couldn't have umpired you couldn't have umpired he couldn't have umpired we couldn't have umpired you couldn't have umpired they couldn't have umpired	I couldn't have been umpiring you couldn't have been umpiring he couldn't have been umpiring we couldn't have been umpiring you couldn't have been umpiring they couldn't have been umpiring

Interrogative form

Simple form	V-ing form
could I umpire? could you umpire? could he umpire? could we umpire? could you umpire? could they umpire?	could I be umpiring? could you be umpiring? could he be umpiring? could we be umpiring? could you be umpiring? could they be umpiring?
Perfect	V-ing perfect
could I have umpired? could you have umpired? could he have umpired? could we have umpired? could you have umpired? could they have umpired?	could I have been umpiring? could you have been umpiring? could he have been umpiring? could we have been umpiring? could you have been umpiring? could they have been umpiring?

Interro-negative form

Simple form	V-ing form
couldn't I umpire? couldn't you umpire? couldn't he umpire? couldn't we umpire? couldn't you umpire? couldn't they umpire?	couldn't I be umpiring? couldn't you be umpiring? couldn't he be umpiring? couldn't we be umpiring? couldn't you be umpiring? couldn't they be umpiring?
Perfect	V-ing perfect
couldn't I have umpired? couldn't you have umpired? couldn't he have umpired? couldn't we have umpired? couldn't you have umpired? couldn't they have umpired?	couldn't I have been umpiring? couldn't you have been umpiring? couldn't he have been umpiring? couldn't we have been umpiring? couldn't you have been umpiring? couldn't they have been umpiring?