can sip
Regular verb: sip - sipped- sipped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can sip
you can sip
he can sip
we can sip
you can sip
they can sip 	I can be sipping
you can be sipping
he can be sipping
we can be sipping
you can be sipping
they can be sipping	I can have sipped
you can have sipped
he can have sipped
we can have sipped
you can have sipped
they can have sipped	I can have been sipping
you can have been sipping
he can have been sipping
we can have been sipping
you can have been sipping
they can have been sipping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't sip
you can't sip
he can't sip
we can't sip
you can't sip
they can't sip 	I can't be sipping
you can't be sipping
he can't be sipping
we can't be sipping
you can't be sipping
they can't be sipping	I can't have sipped
you can't have sipped
he can't have sipped
we can't have sipped
you can't have sipped
they can't have sipped	I can't have been sipping
you can't have been sipping
he can't have been sipping
we can't have been sipping
you can't have been sipping
they can't have been sipping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I sip?
can you sip?
can he sip?
can we sip?
can you sip?
can they sip? 	can I be sipping?
can you be sipping?
can he be sipping?
can we be sipping?
can you be sipping?
can they be sipping? 	can I have sipped?
can you have sipped?
can he have sipped?
can we have sipped?
can you have sipped?
can they have sipped? 	can I have been sipping?
can you have been sipping?
can he have been sipping?
can we have been sipping?
can you have been sipping?
can they have been sipping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I sip?
can't you sip?
can't he sip?
can't we sip?
can't you sip?
can't they sip? 	can't I be sipping?
can't you be sipping?
can't he be sipping?
can't we be sipping?
can't you be sipping?
can't they be sipping? 	can't I have sipped?
can't you have sipped?
can't he have sipped?
can't we have sipped?
can't you have sipped?
can't they have sipped? 	can't I have been sipping?
can't you have been sipping?
can't he have been sipping?
can't we have been sipping?
can't you have been sipping?
can't they have been sipping?