I can contemplate you can contemplate she can contemplate we can contemplate you can contemplate they can contemplate
V-ing form
I can be contemplating you can be contemplating she can be contemplating we can be contemplating you can be contemplating they can be contemplating
Perfect
I can have contemplated you can have contemplated she 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 she can have been contemplating we can have been contemplating you can have been contemplating they can have been contemplating
Negation
Simple form
I cannot contemplate you cannot contemplate she cannot contemplate we cannot contemplate you cannot contemplate they cannot contemplate
V-ing form
I cannot be contemplating you cannot be contemplating she cannot be contemplating we cannot be contemplating you cannot be contemplating they cannot be contemplating
Perfect
I cannot have contemplated you cannot have contemplated she cannot have contemplated we cannot have contemplated you cannot have contemplated they cannot have contemplated
V-ing perfect
I cannot have been contemplating you cannot have been contemplating she cannot have been contemplating we cannot have been contemplating you cannot have been contemplating they cannot have been contemplating
Interrogative form
Simple form
can I contemplate? can you contemplate? can she contemplate? can we contemplate? can you contemplate? can they contemplate?
V-ing form
can I be contemplating? can you be contemplating? can she be contemplating? can we be contemplating? can you be contemplating? can they be contemplating?
Perfect
can I have contemplated? can you have contemplated? can she 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 she have been contemplating? can we have been contemplating? can you have been contemplating? can they have been contemplating?
Interro-negative form
Simple form
can I not contemplate? can you not contemplate? can she not contemplate? can we not contemplate? can you not contemplate? can they not contemplate?
V-ing form
can I not be contemplating? can you not be contemplating? can she not be contemplating? can we not be contemplating? can you not be contemplating? can they not be contemplating?
Perfect
can I not have contemplated? can you not have contemplated? can she not have contemplated? can we not have contemplated? can you not have contemplated? can they not have contemplated?
V-ing perfect
can I not have been contemplating? can you not have been contemplating? can she not have been contemplating? can we not have been contemplating? can you not have been contemplating? can they not have been contemplating?