English verb conjugation
CAN BOIL

Regular verb: boil - boiled - boiled

Affirmation

Simple form	V-ing form
I can boil you can boil he can boil we can boil you can boil they can boil	I can be boiling you can be boiling he can be boiling we can be boiling you can be boiling they can be boiling
Perfect	V-ing perfect
I can have boiled you can have boiled he can have boiled we can have boiled you can have boiled they can have boiled	I can have been boiling you can have been boiling he can have been boiling we can have been boiling you can have been boiling they can have been boiling

Negation

Simple form	V-ing form
I cannot boil you cannot boil he cannot boil we cannot boil you cannot boil they cannot boil	I cannot be boiling you cannot be boiling he cannot be boiling we cannot be boiling you cannot be boiling they cannot be boiling
Perfect	V-ing perfect
I cannot have boiled you cannot have boiled he cannot have boiled we cannot have boiled you cannot have boiled they cannot have boiled	I cannot have been boiling you cannot have been boiling he cannot have been boiling we cannot have been boiling you cannot have been boiling they cannot have been boiling

Interrogative form

Simple form	V-ing form
can I boil? can you boil? can he boil? can we boil? can you boil? can they boil?	can I be boiling? can you be boiling? can he be boiling? can we be boiling? can you be boiling? can they be boiling?
Perfect	V-ing perfect
can I have boiled? can you have boiled? can he have boiled? can we have boiled? can you have boiled? can they have boiled?	can I have been boiling? can you have been boiling? can he have been boiling? can we have been boiling? can you have been boiling? can they have been boiling?

Interro-negative form

Simple form	V-ing form
can I not boil? can you not boil? can he not boil? can we not boil? can you not boil? can they not boil?	can I not be boiling? can you not be boiling? can he not be boiling? can we not be boiling? can you not be boiling? can they not be boiling?
Perfect	V-ing perfect
can I not have boiled? can you not have boiled? can he not have boiled? can we not have boiled? can you not have boiled? can they not have boiled?	can I not have been boiling? can you not have been boiling? can he not have been boiling? can we not have been boiling? can you not have been boiling? can they not have been boiling?