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