Anon: It could be interpreted as a modal form, but the case (grammatically) for that is weak, since it depends not on the words, but the manner of speaking them. Examples of modal forms where the obligation is clear from the words alone - The job must be done ... The job had better be done The job should be done...
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MrPedantic#2 does not strike me as a very natural sequence.How's this one?
MrP
Anonymous"To be done" can have two uses, can't it?Probably even more than two, really.
1) the salad is yet to be done/completed (pending. non-modal).
2) this job is to be done or I'll see why... (pending. modal obligation)