English verb conjugation
CAN ROUGHHOUSE

Regular verb: roughhouse - roughhoused - roughhoused

Affirmation

Simple form	V-ing form
I can roughhouse you can roughhouse he can roughhouse we can roughhouse you can roughhouse they can roughhouse	I can be roughhousing you can be roughhousing he can be roughhousing we can be roughhousing you can be roughhousing they can be roughhousing
Perfect	V-ing perfect
I can have roughhoused you can have roughhoused he can have roughhoused we can have roughhoused you can have roughhoused they can have roughhoused	I can have been roughhousing you can have been roughhousing he can have been roughhousing we can have been roughhousing you can have been roughhousing they can have been roughhousing

Negation

Simple form	V-ing form
I cannot roughhouse you cannot roughhouse he cannot roughhouse we cannot roughhouse you cannot roughhouse they cannot roughhouse	I cannot be roughhousing you cannot be roughhousing he cannot be roughhousing we cannot be roughhousing you cannot be roughhousing they cannot be roughhousing
Perfect	V-ing perfect
I cannot have roughhoused you cannot have roughhoused he cannot have roughhoused we cannot have roughhoused you cannot have roughhoused they cannot have roughhoused	I cannot have been roughhousing you cannot have been roughhousing he cannot have been roughhousing we cannot have been roughhousing you cannot have been roughhousing they cannot have been roughhousing

Interrogative form

Simple form	V-ing form
can I roughhouse? can you roughhouse? can he roughhouse? can we roughhouse? can you roughhouse? can they roughhouse?	can I be roughhousing? can you be roughhousing? can he be roughhousing? can we be roughhousing? can you be roughhousing? can they be roughhousing?
Perfect	V-ing perfect
can I have roughhoused? can you have roughhoused? can he have roughhoused? can we have roughhoused? can you have roughhoused? can they have roughhoused?	can I have been roughhousing? can you have been roughhousing? can he have been roughhousing? can we have been roughhousing? can you have been roughhousing? can they have been roughhousing?

Interro-negative form

Simple form	V-ing form
can I not roughhouse? can you not roughhouse? can he not roughhouse? can we not roughhouse? can you not roughhouse? can they not roughhouse?	can I not be roughhousing? can you not be roughhousing? can he not be roughhousing? can we not be roughhousing? can you not be roughhousing? can they not be roughhousing?
Perfect	V-ing perfect
can I not have roughhoused? can you not have roughhoused? can he not have roughhoused? can we not have roughhoused? can you not have roughhoused? can they not have roughhoused?	can I not have been roughhousing? can you not have been roughhousing? can he not have been roughhousing? can we not have been roughhousing? can you not have been roughhousing? can they not have been roughhousing?