could have been doing may be doing or might be doing

Some of the most common English verbs are irregular. They do not take the –ed ending in the simple past and past participle forms, and their irregular forms ... A past participle (participio ) is a very useful verb form that can function as an adjective or as part of a perfect tense when used in conjunction with the ... The past tense of do is did. The third-person singular simple present indicative form of do is does. The present participle of do is doing. Aug 9, 2016 ... But this tendency does't always lead to the elimination of the old past participle form; for many verbs it seems the simple past form is more ... Mar 31, 2016 ... ... participle of "is," "am," and "are"? For example: Saina is exceptional. How do you change it to present perfect? English Grammar Present. 1 ... Sep 20, 2021 ... The past participle is the third principal part of a verb, typically created by adding -ed, -d or -t to the base form of the regular verb (otherwise known as ... In Portuguese, regular past participles end in 'ado' for first conjugation verbs, and 'ido' for both second and third conjugation verbs ('er' verbs do not use ' ... There are several adjectives in English that are created from the past participle form of the verb. In this case, the past participle becomes a word that ... May 25, 2012 ... A quick tutorial on how to conjugate (form) PAST PARTICIPLES from Spanish verbs. what exactly does past mean in the expression past participle? It certainly ... Adjectival participles do appear in dictionaries (see Martín García 2008 for ...