English verb conjugation
CAN TIER

Regular verb: tier - tiered - tiered

Affirmation

Simple form	V-ing form
I can tier you can tier he can tier we can tier you can tier they can tier	I can be tiering you can be tiering he can be tiering we can be tiering you can be tiering they can be tiering
Perfect	V-ing perfect
I can have tiered you can have tiered he can have tiered we can have tiered you can have tiered they can have tiered	I can have been tiering you can have been tiering he can have been tiering we can have been tiering you can have been tiering they can have been tiering

Negation

Simple form	V-ing form
I can't tier you can't tier he can't tier we can't tier you can't tier they can't tier	I can't be tiering you can't be tiering he can't be tiering we can't be tiering you can't be tiering they can't be tiering
Perfect	V-ing perfect
I can't have tiered you can't have tiered he can't have tiered we can't have tiered you can't have tiered they can't have tiered	I can't have been tiering you can't have been tiering he can't have been tiering we can't have been tiering you can't have been tiering they can't have been tiering

Interrogative form

Simple form	V-ing form
can I tier? can you tier? can he tier? can we tier? can you tier? can they tier?	can I be tiering? can you be tiering? can he be tiering? can we be tiering? can you be tiering? can they be tiering?
Perfect	V-ing perfect
can I have tiered? can you have tiered? can he have tiered? can we have tiered? can you have tiered? can they have tiered?	can I have been tiering? can you have been tiering? can he have been tiering? can we have been tiering? can you have been tiering? can they have been tiering?

Interro-negative form

Simple form	V-ing form
can't I tier? can't you tier? can't he tier? can't we tier? can't you tier? can't they tier?	can't I be tiering? can't you be tiering? can't he be tiering? can't we be tiering? can't you be tiering? can't they be tiering?
Perfect	V-ing perfect
can't I have tiered? can't you have tiered? can't he have tiered? can't we have tiered? can't you have tiered? can't they have tiered?	can't I have been tiering? can't you have been tiering? can't he have been tiering? can't we have been tiering? can't you have been tiering? can't they have been tiering?