I can carpool you can carpool he can carpool we can carpool you can carpool they can carpool
V-ing form
I can be carpooling you can be carpooling he can be carpooling we can be carpooling you can be carpooling they can be carpooling
Perfect
I can have carpooled you can have carpooled he can have carpooled we can have carpooled you can have carpooled they can have carpooled
V-ing perfect
I can have been carpooling you can have been carpooling he can have been carpooling we can have been carpooling you can have been carpooling they can have been carpooling
Negation
Simple form
I cannot carpool you cannot carpool he cannot carpool we cannot carpool you cannot carpool they cannot carpool
V-ing form
I cannot be carpooling you cannot be carpooling he cannot be carpooling we cannot be carpooling you cannot be carpooling they cannot be carpooling
Perfect
I cannot have carpooled you cannot have carpooled he cannot have carpooled we cannot have carpooled you cannot have carpooled they cannot have carpooled
V-ing perfect
I cannot have been carpooling you cannot have been carpooling he cannot have been carpooling we cannot have been carpooling you cannot have been carpooling they cannot have been carpooling
Interrogative form
Simple form
can I carpool? can you carpool? can he carpool? can we carpool? can you carpool? can they carpool?
V-ing form
can I be carpooling? can you be carpooling? can he be carpooling? can we be carpooling? can you be carpooling? can they be carpooling?
Perfect
can I have carpooled? can you have carpooled? can he have carpooled? can we have carpooled? can you have carpooled? can they have carpooled?
V-ing perfect
can I have been carpooling? can you have been carpooling? can he have been carpooling? can we have been carpooling? can you have been carpooling? can they have been carpooling?
Interro-negative form
Simple form
can I not carpool? can you not carpool? can he not carpool? can we not carpool? can you not carpool? can they not carpool?
V-ing form
can I not be carpooling? can you not be carpooling? can he not be carpooling? can we not be carpooling? can you not be carpooling? can they not be carpooling?
Perfect
can I not have carpooled? can you not have carpooled? can he not have carpooled? can we not have carpooled? can you not have carpooled? can they not have carpooled?
V-ing perfect
can I not have been carpooling? can you not have been carpooling? can he not have been carpooling? can we not have been carpooling? can you not have been carpooling? can they not have been carpooling?