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 cannot umpire you cannot umpire he cannot umpire we cannot umpire you cannot umpire they cannot umpire	I cannot be umpiring you cannot be umpiring he cannot be umpiring we cannot be umpiring you cannot be umpiring they cannot be umpiring
Perfect	V-ing perfect
I cannot have umpired you cannot have umpired he cannot have umpired we cannot have umpired you cannot have umpired they cannot have umpired	I cannot have been umpiring you cannot have been umpiring he cannot have been umpiring we cannot have been umpiring you cannot have been umpiring they cannot 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 I not umpire? can you not umpire? can he not umpire? can we not umpire? can you not umpire? can they not umpire?	can I not be umpiring? can you not be umpiring? can he not be umpiring? can we not be umpiring? can you not be umpiring? can they not be umpiring?
Perfect	V-ing perfect
can I not have umpired? can you not have umpired? can he not have umpired? can we not have umpired? can you not have umpired? can they not have umpired?	can I not have been umpiring? can you not have been umpiring? can he not have been umpiring? can we not have been umpiring? can you not have been umpiring? can they not have been umpiring?