can assist
Regular verb: assist - assisted- assisted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can assist
you can assist
she can assist
we can assist
you can assist
they can assist 	I can be assisting
you can be assisting
she can be assisting
we can be assisting
you can be assisting
they can be assisting	I can have assisted
you can have assisted
she can have assisted
we can have assisted
you can have assisted
they can have assisted	I can have been assisting
you can have been assisting
she can have been assisting
we can have been assisting
you can have been assisting
they can have been assisting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't assist
you can't assist
she can't assist
we can't assist
you can't assist
they can't assist 	I can't be assisting
you can't be assisting
she can't be assisting
we can't be assisting
you can't be assisting
they can't be assisting	I can't have assisted
you can't have assisted
she can't have assisted
we can't have assisted
you can't have assisted
they can't have assisted	I can't have been assisting
you can't have been assisting
she can't have been assisting
we can't have been assisting
you can't have been assisting
they can't have been assisting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I assist?
can you assist?
can she assist?
can we assist?
can you assist?
can they assist? 	can I be assisting?
can you be assisting?
can she be assisting?
can we be assisting?
can you be assisting?
can they be assisting? 	can I have assisted?
can you have assisted?
can she have assisted?
can we have assisted?
can you have assisted?
can they have assisted? 	can I have been assisting?
can you have been assisting?
can she have been assisting?
can we have been assisting?
can you have been assisting?
can they have been assisting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I assist?
can't you assist?
can't she assist?
can't we assist?
can't you assist?
can't they assist? 	can't I be assisting?
can't you be assisting?
can't she be assisting?
can't we be assisting?
can't you be assisting?
can't they be assisting? 	can't I have assisted?
can't you have assisted?
can't she have assisted?
can't we have assisted?
can't you have assisted?
can't they have assisted? 	can't I have been assisting?
can't you have been assisting?
can't she have been assisting?
can't we have been assisting?
can't you have been assisting?
can't they have been assisting?