We used to play AD&D for 15 years and now want to "upgrade" to 5e.
Do bonus actions need to be announced at the beginning of the round, like normal action announcements, when the DM starts asking the PCs what the want to do in the given round?
The relevance of this question is that some spells can be cast as a bonus action and the player can still have an action (e.g. make an attack) in the same round. So if the player (a cleric) only announced at the beginning of the round to the DM that he/she only wants to make a melee attack, but during the round he/she realizes that one of the party members has got heavily injured, can he/she besides the melee attack cast a Healing word as a bonus action even if not announced to the DM before?