The term 'I'd be happy to!' can be expressed in three different ways using crossword solutions. The first solution is YES, which is a three letter word meaning 'an affirmative answer or assent'. The second solution is GLADLY, which is a six letter word meaning 'in a willing and eager manner'. The third solution is SURE, which is a four letter word meaning 'certainly; definitely'. The fourth solution is ITSNOBOTHER, which is an eleven letter phrase meaning 'it's no trouble; I don't mind'. All of these solutions express the sentiment of being willing and eager to do something.