My advice is predicated on my experience.

This sentence has a predicate but no subject.

'Verb' refers to the predicate verb. Predicate verbs change their form depending on the subject and the time expressed.

The sentence must have a predicate.

Lojban has incorporated a detailed grammar for mathematical expressions. This grammar parallels the predicate grammar of the non-mathematical language.

Should we exercise yet how to translate sentences containing a subject, a predicate and an object? Or should we go further?