5.一般疑问句:have或has提前。 6.例句:I've written an article. It has been raining these days. 六、过去完成时 1.概念:以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即“过去的过去”。 2.时间状语:before, by the end of last y...
1 Do you have a vegetable garden? Have you ever w__71__ a seed sprout(发芽) and grow and fruit until it became the tomato on your plate? If you go to school in the US, ther...
Fence had ___6___ about 2,000 miles from north tosouth. But over time, the fence proved tobe no match for ( 不敌) rabbits. Othermajor efforts ___7___ programs to destroyrab...
1. 如果主句的时态是一般现在时,宾语从句的时态根据具体情况来确定。 Please tell us where we’ll go fishing tomorrow. Do you know when Mr. Smith moved here? 2. 如果主句的时态是...
2. have (has) been to表示"曾经去过某地",不能与for+一段时间连用。 She has been to Shanghai three times.(她已经不在上海,只说明她曾经去过。) 3. have (has) been in/at表示"一直...
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