On grammatical class:

cu'e
tense/modal question.
nau
tense: refers to current space/time reference absolutely.
ba'au
tense: refers to future of current space/time reference absolutely
pu'au
tense: refers to past of current space/time reference absolutely
fe'enau
tense: right here; refers to current spatial reference absolutely

In definition:

cmavrcu'e
x1 is the selma'o "CUhE".

In notes:

saptoda
x1 is a part of Lojban text representing rule 'simple-tense-modal' according to the first edition of the book 'The Complete Lojban Language'.