I'm on page 14 of An Introduction to Greek by Crosby & Schaeffer and I've hit a road-block... This text is OLD, and obviously meant for a classroom setting.
What is a linking verb? The book doesn't say.
PS, excuse my lack of accent marks. This example is probably something like 'You wish to write that there were trees in the field,' or some such boring sentence:
εθελετε γραφ___ τα δενδρ___ ___(linking verb) εν τ___ πεδι___(singular).