i dont think i (have seen) you in that dress before为什么要用现在完成时?

I dont think but i dont'think i dont think about what i have done,i think about what i have contributed woooo i dont think so! we dont think与i dont think的区别 i dont think i (have seen) you in that dress before为什么要用现在完成时? i dont have any thats I dont have bike now I dont why I have to try i dont think we have met before 中为什么不用had met i dont i dont i dont i dont I dont like bananas .I think they are too sweet . i dont have-----【some】sister-------[and] borthers I think i have lost i donts have a sister还是i dont have sister