I can welcome you can welcome she can welcome we can welcome you can welcome they can welcome
V-ing form
I can be welcoming you can be welcoming she can be welcoming we can be welcoming you can be welcoming they can be welcoming
Perfect
I can have welcomed you can have welcomed she can have welcomed we can have welcomed you can have welcomed they can have welcomed
V-ing perfect
I can have been welcoming you can have been welcoming she can have been welcoming we can have been welcoming you can have been welcoming they can have been welcoming
Negation
Simple form
I cannot welcome you cannot welcome she cannot welcome we cannot welcome you cannot welcome they cannot welcome
V-ing form
I cannot be welcoming you cannot be welcoming she cannot be welcoming we cannot be welcoming you cannot be welcoming they cannot be welcoming
Perfect
I cannot have welcomed you cannot have welcomed she cannot have welcomed we cannot have welcomed you cannot have welcomed they cannot have welcomed
V-ing perfect
I cannot have been welcoming you cannot have been welcoming she cannot have been welcoming we cannot have been welcoming you cannot have been welcoming they cannot have been welcoming
Interrogative form
Simple form
can I welcome? can you welcome? can she welcome? can we welcome? can you welcome? can they welcome?
V-ing form
can I be welcoming? can you be welcoming? can she be welcoming? can we be welcoming? can you be welcoming? can they be welcoming?
Perfect
can I have welcomed? can you have welcomed? can she have welcomed? can we have welcomed? can you have welcomed? can they have welcomed?
V-ing perfect
can I have been welcoming? can you have been welcoming? can she have been welcoming? can we have been welcoming? can you have been welcoming? can they have been welcoming?
Interro-negative form
Simple form
can I not welcome? can you not welcome? can she not welcome? can we not welcome? can you not welcome? can they not welcome?
V-ing form
can I not be welcoming? can you not be welcoming? can she not be welcoming? can we not be welcoming? can you not be welcoming? can they not be welcoming?
Perfect
can I not have welcomed? can you not have welcomed? can she not have welcomed? can we not have welcomed? can you not have welcomed? can they not have welcomed?
V-ing perfect
can I not have been welcoming? can you not have been welcoming? can she not have been welcoming? can we not have been welcoming? can you not have been welcoming? can they not have been welcoming?