I can welcome you can welcome he can welcome we can welcome you can welcome they can welcome
V-ing form
I can be welcoming you can be welcoming he can be welcoming we can be welcoming you can be welcoming they can be welcoming
Perfect
I can have welcomed you can have welcomed he 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 he 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 he cannot welcome we cannot welcome you cannot welcome they cannot welcome
V-ing form
I cannot be welcoming you cannot be welcoming he cannot be welcoming we cannot be welcoming you cannot be welcoming they cannot be welcoming
Perfect
I cannot have welcomed you cannot have welcomed he 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 he 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 he welcome? can we welcome? can you welcome? can they welcome?
V-ing form
can I be welcoming? can you be welcoming? can he be welcoming? can we be welcoming? can you be welcoming? can they be welcoming?
Perfect
can I have welcomed? can you have welcomed? can he 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 he 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 he 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 he 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 he 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 he not have been welcoming? can we not have been welcoming? can you not have been welcoming? can they not have been welcoming?