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 cannot boost you cannot boost he cannot boost we cannot boost you cannot boost they cannot boost
V-ing form
I cannot be boosting you cannot be boosting he cannot be boosting we cannot be boosting you cannot be boosting they cannot be boosting
Perfect
I cannot have boosted you cannot have boosted he cannot have boosted we cannot have boosted you cannot have boosted they cannot have boosted
V-ing perfect
I cannot have been boosting you cannot have been boosting he cannot have been boosting we cannot have been boosting you cannot have been boosting they cannot 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 I not boost? can you not boost? can he not boost? can we not boost? can you not boost? can they not boost?
V-ing form
can I not be boosting? can you not be boosting? can he not be boosting? can we not be boosting? can you not be boosting? can they not be boosting?
Perfect
can I not have boosted? can you not have boosted? can he not have boosted? can we not have boosted? can you not have boosted? can they not have boosted?
V-ing perfect
can I not have been boosting? can you not have been boosting? can he not have been boosting? can we not have been boosting? can you not have been boosting? can they not have been boosting?