English verb conjugation
COULD ASSIST

Regular verb: assist - assisted - assisted

Affirmation

Simple form	V-ing form
I could assist you could assist he could assist we could assist you could assist they could assist	I could be assisting you could be assisting he could be assisting we could be assisting you could be assisting they could be assisting
Perfect	V-ing perfect
I could have assisted you could have assisted he could have assisted we could have assisted you could have assisted they could have assisted	I could have been assisting you could have been assisting he could have been assisting we could have been assisting you could have been assisting they could have been assisting

Negation

Simple form	V-ing form
I couldn't assist you couldn't assist he couldn't assist we couldn't assist you couldn't assist they couldn't assist	I couldn't be assisting you couldn't be assisting he couldn't be assisting we couldn't be assisting you couldn't be assisting they couldn't be assisting
Perfect	V-ing perfect
I couldn't have assisted you couldn't have assisted he couldn't have assisted we couldn't have assisted you couldn't have assisted they couldn't have assisted	I couldn't have been assisting you couldn't have been assisting he couldn't have been assisting we couldn't have been assisting you couldn't have been assisting they couldn't have been assisting

Interrogative form

Simple form	V-ing form
could I assist? could you assist? could he assist? could we assist? could you assist? could they assist?	could I be assisting? could you be assisting? could he be assisting? could we be assisting? could you be assisting? could they be assisting?
Perfect	V-ing perfect
could I have assisted? could you have assisted? could he have assisted? could we have assisted? could you have assisted? could they have assisted?	could I have been assisting? could you have been assisting? could he have been assisting? could we have been assisting? could you have been assisting? could they have been assisting?

Interro-negative form

Simple form	V-ing form
couldn't I assist? couldn't you assist? couldn't he assist? couldn't we assist? couldn't you assist? couldn't they assist?	couldn't I be assisting? couldn't you be assisting? couldn't he be assisting? couldn't we be assisting? couldn't you be assisting? couldn't they be assisting?
Perfect	V-ing perfect
couldn't I have assisted? couldn't you have assisted? couldn't he have assisted? couldn't we have assisted? couldn't you have assisted? couldn't they have assisted?	couldn't I have been assisting? couldn't you have been assisting? couldn't he have been assisting? couldn't we have been assisting? couldn't you have been assisting? couldn't they have been assisting?