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We present two classes of stars with yet unknown evolutionary phase: the B[e]supergiants and the so-called unclassified B[e] stars. While the B[e]supergiants are luminous post-main sequence stars with high mass progenitors,not much is known of the unclassified stars. We discuss how it might bepossible to determine their evolutionary phases in the area of new largetelescopes.Comment: 4 pages, to appear in proceedings of "Stellar Astrophysics with the  World Largest Telescopes", eds. J. Mikolajewska & A. Olec

The evolutionary phase of B[e] supergiants and unclassified B[e] stars