I can time you can time he can time we can time you can time they can time
V-ing form
I can be timing you can be timing he can be timing we can be timing you can be timing they can be timing
Perfect
I can have timed you can have timed he can have timed we can have timed you can have timed they can have timed
V-ing perfect
I can have been timing you can have been timing he can have been timing we can have been timing you can have been timing they can have been timing
Negation
Simple form
I cannot time you cannot time he cannot time we cannot time you cannot time they cannot time
V-ing form
I cannot be timing you cannot be timing he cannot be timing we cannot be timing you cannot be timing they cannot be timing
Perfect
I cannot have timed you cannot have timed he cannot have timed we cannot have timed you cannot have timed they cannot have timed
V-ing perfect
I cannot have been timing you cannot have been timing he cannot have been timing we cannot have been timing you cannot have been timing they cannot have been timing
Interrogative form
Simple form
can I time? can you time? can he time? can we time? can you time? can they time?
V-ing form
can I be timing? can you be timing? can he be timing? can we be timing? can you be timing? can they be timing?
Perfect
can I have timed? can you have timed? can he have timed? can we have timed? can you have timed? can they have timed?
V-ing perfect
can I have been timing? can you have been timing? can he have been timing? can we have been timing? can you have been timing? can they have been timing?
Interro-negative form
Simple form
can I not time? can you not time? can he not time? can we not time? can you not time? can they not time?
V-ing form
can I not be timing? can you not be timing? can he not be timing? can we not be timing? can you not be timing? can they not be timing?
Perfect
can I not have timed? can you not have timed? can he not have timed? can we not have timed? can you not have timed? can they not have timed?
V-ing perfect
can I not have been timing? can you not have been timing? can he not have been timing? can we not have been timing? can you not have been timing? can they not have been timing?