The general formula of the present perfect tense is as described below: Subject + have/has + past participle + the rest of the sentence. The structure of the present perfect tense can be analysed with reference to positive, negative, interrogative and negative interrogative types of sentences. The Present Perfect tense is a rather important tense in English, but it gives speakers of some languages a difficult time. That is because it uses concepts or ideas that do not exist in those languages. In fact, the structure of the Present Perfect is very simple. The problems come with the use of the tense. The present perfect progressive tense combines have/has with been and the verb to show that the action began in the past and is still occurring in the present. [Main clause "I suggest" is factual and in indicative mood; dependent clause "we wait until" is hypothetical and in subjunctive mood.] The Conditional Mood. present participle: past participle: (to) wait waiting waited definition in Spanish in French in Italian Indicative Perfect tenses Continuous (progressive) and emphatic tenses Compound continuous (progressive) tenses Conditional Imperative Subjunctive *Blue letters in conjugations are irregular forms. ( example) It's time to learn the PRESENT PERFECT. What does it mean to say "I have worked" or "I have understood"? Many students are confused by the PRESENT PERFECT TE Present Perfect. Karen me an e-mail. (to send) Dave and Pat the museum. (to visit) I at the pet shop. (to be) They already their backpacks. (to pack) Marcus an accident. (to have) We the shopping for our grandmother. (to do) I just my bike. (to clean) Emily her room. (to paint) 9. I (wait) here until you (come) back tomorrow. 10. I (send) you some postcards as soon as I (arrive) in London. IX. Give the right forms of the verbs in brackets: Simple Present, Simple Future, Present Perfect or Future Perfect. 1. I'll wait until he (finish) his novel. 2. When you (come) back, he already (buy) a new house. 3. In other words, present perfect progressive Spanish is used to describe a continuous action that was initiated in the past and continues to happen. And to use this tense, all you need is the below formula: Auxiliary verb Haber conjugated + the past participle of Estar + gerund of the main verb + complement. Now, some examples of this tense in Conjugate the English verb not wait: indicative, past tense, participle, present perfect, gerund, conjugation models and irregular verbs. Translate not wait in context, with examples of use and definition. Present perfect relates to things that started in the past and have some effect that lasts until the present. Sentence A is correct because the person is still waiting. Sentence B is incorrect because the person is no longer waiting - no lasting effect. BBi3X.