can pip
Regular verb: pip - pipped- pipped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can pip
you can pip
he can pip
we can pip
you can pip
they can pip 	I can be pipping
you can be pipping
he can be pipping
we can be pipping
you can be pipping
they can be pipping	I can have pipped
you can have pipped
he can have pipped
we can have pipped
you can have pipped
they can have pipped	I can have been pipping
you can have been pipping
he can have been pipping
we can have been pipping
you can have been pipping
they can have been pipping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot pip
you cannot pip
he cannot pip
we cannot pip
you cannot pip
they cannot pip 	I cannot be pipping
you cannot be pipping
he cannot be pipping
we cannot be pipping
you cannot be pipping
they cannot be pipping	I cannot have pipped
you cannot have pipped
he cannot have pipped
we cannot have pipped
you cannot have pipped
they cannot have pipped	I cannot have been pipping
you cannot have been pipping
he cannot have been pipping
we cannot have been pipping
you cannot have been pipping
they cannot have been pipping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I pip?
can you pip?
can he pip?
can we pip?
can you pip?
can they pip? 	can I be pipping?
can you be pipping?
can he be pipping?
can we be pipping?
can you be pipping?
can they be pipping? 	can I have pipped?
can you have pipped?
can he have pipped?
can we have pipped?
can you have pipped?
can they have pipped? 	can I have been pipping?
can you have been pipping?
can he have been pipping?
can we have been pipping?
can you have been pipping?
can they have been pipping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not pip?
can you not pip?
can he not pip?
can we not pip?
can you not pip?
can they not pip? 	can I not be pipping?
can you not be pipping?
can he not be pipping?
can we not be pipping?
can you not be pipping?
can they not be pipping? 	can I not have pipped?
can you not have pipped?
can he not have pipped?
can we not have pipped?
can you not have pipped?
can they not have pipped? 	can I not have been pipping?
can you not have been pipping?
can he not have been pipping?
can we not have been pipping?
can you not have been pipping?
can they not have been pipping?