Are there morphological errors, e.g. a noun is required but an adjective form has been used?
Is word order appropriate in simple, compound and complex sentences?
Are clauses constructed appropriately with the correct conjunctions
Are ideas joined with appropriate linking words?
Which verb tenses seem under control and which show less control?
Are vocabulary choices appropriate (level of formality, connotation) and do they show a wide range of vocabulary?
Is cohesion maintained through referencing (use of pronouns or synonyms to avoid repetition)?
