为什么用 现在完成时 have starteda girl who have just started school but whose family can not afford her education

have finished 为什么要用现在完成时? I have been to Beijing twice 为什么用现在完成时 为什么现在完成时也要有现在完成时的动词have/has结构 现在完成时 为什么有时have 后有been, I have never thought about it 为什么要用现在完成时呢 不加have可以吗 为什么现在完成时,是用have 提问的,那have再这里是什么意思? 为什么“this is the first time i have baked it为什么后面用现在完成时?“i have baked it为什么后面用现在完成时? The famous star Jackie chan has already arrived here Really?i ___he was coming tomorrow为什么用thought,不用had thought,不是原以为么?这里是和时间先后有关系么?是不是现在完成时往后退一格是过去时?那什么have tho 为什么用swimming star 而不用 swim star I have just arrived by train这里为什么要用现在完成时呢 i dont think i (have seen) you in that dress before为什么要用现在完成时? when you have done something well,they saygood job为什么用现在完成时 You have just missed the train.这句为什么要用现在完成时 i have got to drop by the shop to do some shopping为什么用现在完成时? it must have rained yesterday为什么不能用had rained?现在完成时怎么用? Something may have happened to her.这里为什么要用现在完成时 Recently we have been busy.最近我们很忙.为什么用现在完成时? 现在完成时I用have还是has?