| 1. | The verb must be in the present perfect tense 动词必须用现在完成时态。 |
| 2. | " recently " has the widest use , in positive and negative statements and questions , with the past tense and the present perfect tense “recently”用法最广,可用于肯定式陈述句、否定式陈述句及疑问句中,与过去时态和现在完成时态连用。 |
| 3. | To grasp the usage of the present perfect tense 掌握现在完成时态的用法 |
| 4. | Present continuous and present perfect passives with prepositions of cause 现在进行式和现在完成式 |
| 5. | Present perfect continuous tense 现在完成进行时 |
| 6. | Present perfect tense 过去完成时 |
| 7. | To grasp “ the present perfect ” and the irregular verbs ' past tense & past participle tense 掌握现在完成时态以及不规则动词的过去时态和过去分词。 |
| 8. | We use the present perfect to talk about something that began in the past and still continues now 我们使用现在完成式去说明某事开始于过去并持续到现在。 |
| 9. | Present perfect as opposed to past simple . past simple as opposed to past continuous and past perfect 现在完成时和一般过去时的对比;一般过去时和过去进行时、 |
| 10. | The present perfect tense is always connected with present time , hence it is net used with “ yesterday ” , “ last year ” , etc 现在完成时总是和现在有关,所以它不能和“昨天” 、 “去年”等一起用。 |