Communication is mostly vocabulary. Being able to say and understand "men 2 talk the table at together" is fluent. The grammar is weak but the meaning will be understood.
Building at least a high school level vocabulary is vital.
We fully embrace the Oxford 3000 Learner's dictionary. English experts at Oxford have chosen approximately 3,300 words which comprise a native English speaker high school level vocabulary. We help you review the words you know, master new words, and demonstrate you have learned.
We will help you master a university level vocabulary if you care to.