| 词汇 | present-perfect |
| 释义 | the present perfect noun[ S ] uk /ˌprez.ənt ˈpɜː.fekt/ us /ˌprez.ənt ˈpɝː.fekt/ the form of the verb used for actions or events that have been completed or have happened in a period of time up to now: 现在完成时 The sentences "She has talked to her doctor about the problem" and "I have never been to Australia" are all in the present perfect.句子 She has broken her leg 和 I have never been to Australia 用的都是现在完成时。 'I have seen it' is an example of the present perfect. The sentence 'I have told him' is in the present perfect tense. Linguistics: verb forms, tenses & types of verbs accusative art bare infinitive bent continuous copula finite gerund modality non-finite non-progressive passive passivization perfective present participle subjunctive the active voice the future perfect the past continuous the past tense GrammarCompleted or continuing events We use the present perfect simple with action verbs to emphasise the completion of an event in the recent past. We use the present perfect continuous to talk about ongoing events or activities which started at a time in the past and are still continuing up until now. … Mental process and sense verbs Some verbs are not used very often in the continuous form. … Present perfect: typical errors We don’t use since with periods of time: … Past simple or present perfect? Past simple = I worked Present perfect = I have worked … Present perfect continuous (I have been working) We use have/has + been + the -ing form of the verb. … Present perfect continuous: form We use have/has + been + the -ing form of the verb. … Present perfect continuous: uses We use the present perfect continuous to talk about a finished activity in the recent past. Using the present perfect continuous focuses on the activity. … Present perfect simple (I have worked) We use have/has + the -ed form of the verb. … Present perfect simple: form We use have/has + the -ed form of the verb. … Present perfect simple: uses We use the present perfect simple to refer to events in the past but which connect to the present. … Present perfect simple or present perfect continuous? We use the present perfect simple with action verbs to emphasise the completion of an event in the recent past. We use the present perfect continuous to talk about ongoing events or activities which started at a time in the past and are still continuing up until now. … present perfect | American Dictionarypresent perfect noun[ U ] us/ˈprez·ənt ˈpɜr·fɪkt/ grammar the tense you use to talk about actions or events that happen in both the past and the present: The sentence "She has broken her leg" is in the present perfect. |
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