can sip
Regular verb: sip - sipped- sipped

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