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Complete List of 638 English Irregular Verbs with their forms in different tenses. Mind Our English: Strong and weak by Ralph Berry; English Irregular Verb List A comprehensive list of English irregular verbs, including their base form, past simple, past participle, 3rd person singular, and the present participle / gerund.
In perfect progressive (or perfect continuous) constructions, the perfect auxiliary (a form of have) is followed by the past participle been (from be, the auxiliary of the progressive aspect), which in turn is followed by the present participle of the main verb. As before, the perfect auxiliary can appear in various tenses, moods and non-finite ...
The perfect aspect is expressed with a form of the auxiliary have together with the past participle of the verb. Thus the present perfect is have written or has written, and the past perfect (pluperfect) is had written. The perfect can combine with the progressive aspect (see above) to produce the present perfect progressive (continuous) have ...
In English grammar, the pluperfect (e.g. "had written") is now usually called the past perfect, since it combines past tense with perfect aspect. (The same term is sometimes used in relation to the grammar of other languages.) English also has a past perfect progressive (or past perfect continuous) form: "had been writing".
The imperfect (abbreviated IMPERF) is a verb form that combines past tense (reference to a past time) and imperfective aspect (reference to a continuing or repeated event or state). It can have meanings similar to the English "was walking" or "used to walk".
It is a past tense that indicates an action taken once in the past that was completed at some point in the past (translated: "<verb>ed"). This is as opposed to the imperfect (l'imparfait), used in expressing repeated, continual, or habitual past actions (often corresponding to English's past continuous was/were <verb>ing or habitual used to ...
In some weak verbs ending in a final -t or -d, this final consonant coalesced with the weak past ending to leave a single -t or -d in the past forms. Some verbs ending in l or n had their past ending irregularly devoiced to -t, and in a few verbs ending with a v or z sound (leave, lose), both
The perfect infinitive can further be governed by modal verbs to express various meanings, mostly combining modality with past reference: "I should have eaten" etc. In particular, the modals will and shall and their subjunctive forms would and should are used to combine future or hypothetical reference with aspectual meaning: