English verb conjugation
CAN UMPIRE

Regular verb: umpire - umpired - umpired

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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