I've got the answer I think to 6 across (Auxiliary verbs) but where does Mood fit in? And 6 down (Slates), Plans overdue on board, shouldn't it be 'Pans'?
Scorpiojo the clue for 3 across was Mood perhaps created by May and Will for example Answer: Auxiliary verbs. I get the May and Will bit, but not the Mood bit.
n. Abbr. aux. or aux. v.
A verb, such as have, can, or will, that accompanies the main verb in a clause and helps to make distinctions in mood, voice, aspect, and tense.