I could apprentice you could apprentice he could apprentice we could apprentice you could apprentice they could apprentice
V-ing form
I could be apprenticing you could be apprenticing he could be apprenticing we could be apprenticing you could be apprenticing they could be apprenticing
Perfect
I could have apprenticed you could have apprenticed he could have apprenticed we could have apprenticed you could have apprenticed they could have apprenticed
V-ing perfect
I could have been apprenticing you could have been apprenticing he could have been apprenticing we could have been apprenticing you could have been apprenticing they could have been apprenticing
Negation
Simple form
I couldn't apprentice you couldn't apprentice he couldn't apprentice we couldn't apprentice you couldn't apprentice they couldn't apprentice
V-ing form
I couldn't be apprenticing you couldn't be apprenticing he couldn't be apprenticing we couldn't be apprenticing you couldn't be apprenticing they couldn't be apprenticing
Perfect
I couldn't have apprenticed you couldn't have apprenticed he couldn't have apprenticed we couldn't have apprenticed you couldn't have apprenticed they couldn't have apprenticed
V-ing perfect
I couldn't have been apprenticing you couldn't have been apprenticing he couldn't have been apprenticing we couldn't have been apprenticing you couldn't have been apprenticing they couldn't have been apprenticing
Interrogative form
Simple form
could I apprentice? could you apprentice? could he apprentice? could we apprentice? could you apprentice? could they apprentice?
V-ing form
could I be apprenticing? could you be apprenticing? could he be apprenticing? could we be apprenticing? could you be apprenticing? could they be apprenticing?
Perfect
could I have apprenticed? could you have apprenticed? could he have apprenticed? could we have apprenticed? could you have apprenticed? could they have apprenticed?
V-ing perfect
could I have been apprenticing? could you have been apprenticing? could he have been apprenticing? could we have been apprenticing? could you have been apprenticing? could they have been apprenticing?
Interro-negative form
Simple form
couldn't I apprentice? couldn't you apprentice? couldn't he apprentice? couldn't we apprentice? couldn't you apprentice? couldn't they apprentice?
V-ing form
couldn't I be apprenticing? couldn't you be apprenticing? couldn't he be apprenticing? couldn't we be apprenticing? couldn't you be apprenticing? couldn't they be apprenticing?
Perfect
couldn't I have apprenticed? couldn't you have apprenticed? couldn't he have apprenticed? couldn't we have apprenticed? couldn't you have apprenticed? couldn't they have apprenticed?
V-ing perfect
couldn't I have been apprenticing? couldn't you have been apprenticing? couldn't he have been apprenticing? couldn't we have been apprenticing? couldn't you have been apprenticing? couldn't they have been apprenticing?