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GB 50334-2017 城镇污水处理厂工程质量验收规范

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ense. Tell them the use of “ for “ and “since”. Give more sample sentences. 佰唤并砂Р4. Explain to students that the present perfect tense can also be used in sentences without the adverbs which determine its definite use. In those cases, students need to understand the function of the action affecting the present, eg. She has arrived. We know that she has arrived some time before now, but we do not know when. The simple past tense is used if we have a fixed time, eg. She arrived this morning.佰唤并砂Р5. Work through a few more example sentences illustrating the difference between the simple past tense and the present perfect tense.佰唤并砂Р佰唤并砂Р四、归纳总结、巩固提高佰唤并砂Р1.what you have learnt?佰唤并砂Р佰唤并砂Р2. The understanding of the present perfect tense佰唤并砂Р3.The use of the perfect tense: have/ has +p.p佰唤并砂Р佰唤并砂

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