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