I'd like to, but I have no time to go to the party.
我很想去，但我没时间去参加聚会。
I'd like to, but I have an appointment with Mr. Johnson.
我很想去，但我已经和约翰逊先生有约了。
I'd like to, but I'll be a little late.
我很愿意，但我要来得晚点。