You should realize that you don't have to choose from two sentences: you can make up one that is not ambiguous:I think sometimes it's not so clear cut which one to use:
"Those who would like to sing a song will be welcomed/welcome." (coming from a host inviting people to sing at a party)
This is how I interpret the two meanings, and I may be wrong:
"...will be welcomed (by the people there)"
"...will be welcome (to do so)"
But is my interpretation correct?You should realize that you don't have to choose from two sentences: you can make up one that is not ambiguous:
Those who would like to sing are welcome to do so.
They are grammatically correct, but do not have the same meaning.Our customers are always welcome.
Our customers are always welcomed.![]()