Tenses, Agreement and Verb Forms
The verbal routine for fill-in and error questions, tense choice from time markers, the present perfect and past perfect, sequence of tenses in reported speech, the present tense in future time clauses, the four conditional types and inverted conditionals, stative verbs, subjunctive forms, no sooner and hardly patterns, subject-verb agreement (head noun, intervening phrases, either/neither, none, each and every, collective nouns, a number of, amounts, titles, gerunds), infinitive or gerund after a verb, and active to passive. All example sentences are original.
