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