I can boost you can boost he can boost we can boost you can boost they can boost
V-ing form
I can be boosting you can be boosting he can be boosting we can be boosting you can be boosting they can be boosting
Perfect
I can have boosted you can have boosted he can have boosted we can have boosted you can have boosted they can have boosted
V-ing perfect
I can have been boosting you can have been boosting he can have been boosting we can have been boosting you can have been boosting they can have been boosting
Negation
Simple form
I can't boost you can't boost he can't boost we can't boost you can't boost they can't boost
V-ing form
I can't be boosting you can't be boosting he can't be boosting we can't be boosting you can't be boosting they can't be boosting
Perfect
I can't have boosted you can't have boosted he can't have boosted we can't have boosted you can't have boosted they can't have boosted
V-ing perfect
I can't have been boosting you can't have been boosting he can't have been boosting we can't have been boosting you can't have been boosting they can't have been boosting
Interrogative form
Simple form
can I boost? can you boost? can he boost? can we boost? can you boost? can they boost?
V-ing form
can I be boosting? can you be boosting? can he be boosting? can we be boosting? can you be boosting? can they be boosting?
Perfect
can I have boosted? can you have boosted? can he have boosted? can we have boosted? can you have boosted? can they have boosted?
V-ing perfect
can I have been boosting? can you have been boosting? can he have been boosting? can we have been boosting? can you have been boosting? can they have been boosting?
Interro-negative form
Simple form
can't I boost? can't you boost? can't he boost? can't we boost? can't you boost? can't they boost?
V-ing form
can't I be boosting? can't you be boosting? can't he be boosting? can't we be boosting? can't you be boosting? can't they be boosting?
Perfect
can't I have boosted? can't you have boosted? can't he have boosted? can't we have boosted? can't you have boosted? can't they have boosted?
V-ing perfect
can't I have been boosting? can't you have been boosting? can't he have been boosting? can't we have been boosting? can't you have been boosting? can't they have been boosting?