English verb conjugation
COULD DROWSE

Regular verb: drowse - drowsed - drowsed

Affirmation

Simple form	V-ing form
I could drowse you could drowse she could drowse we could drowse you could drowse they could drowse	I could be drowsing you could be drowsing she could be drowsing we could be drowsing you could be drowsing they could be drowsing
Perfect	V-ing perfect
I could have drowsed you could have drowsed she could have drowsed we could have drowsed you could have drowsed they could have drowsed	I could have been drowsing you could have been drowsing she could have been drowsing we could have been drowsing you could have been drowsing they could have been drowsing

Negation

Simple form	V-ing form
I couldn't drowse you couldn't drowse she couldn't drowse we couldn't drowse you couldn't drowse they couldn't drowse	I couldn't be drowsing you couldn't be drowsing she couldn't be drowsing we couldn't be drowsing you couldn't be drowsing they couldn't be drowsing
Perfect	V-ing perfect
I couldn't have drowsed you couldn't have drowsed she couldn't have drowsed we couldn't have drowsed you couldn't have drowsed they couldn't have drowsed	I couldn't have been drowsing you couldn't have been drowsing she couldn't have been drowsing we couldn't have been drowsing you couldn't have been drowsing they couldn't have been drowsing

Interrogative form

Simple form	V-ing form
could I drowse? could you drowse? could she drowse? could we drowse? could you drowse? could they drowse?	could I be drowsing? could you be drowsing? could she be drowsing? could we be drowsing? could you be drowsing? could they be drowsing?
Perfect	V-ing perfect
could I have drowsed? could you have drowsed? could she have drowsed? could we have drowsed? could you have drowsed? could they have drowsed?	could I have been drowsing? could you have been drowsing? could she have been drowsing? could we have been drowsing? could you have been drowsing? could they have been drowsing?

Interro-negative form

Simple form	V-ing form
couldn't I drowse? couldn't you drowse? couldn't she drowse? couldn't we drowse? couldn't you drowse? couldn't they drowse?	couldn't I be drowsing? couldn't you be drowsing? couldn't she be drowsing? couldn't we be drowsing? couldn't you be drowsing? couldn't they be drowsing?
Perfect	V-ing perfect
couldn't I have drowsed? couldn't you have drowsed? couldn't she have drowsed? couldn't we have drowsed? couldn't you have drowsed? couldn't they have drowsed?	couldn't I have been drowsing? couldn't you have been drowsing? couldn't she have been drowsing? couldn't we have been drowsing? couldn't you have been drowsing? couldn't they have been drowsing?