I think I failed the french paper.

I think I failed the french paper. I hope I haven`t failed.为什么用完成时?而I think I failed the French paper.却用过去式? I hope I haven't failed./I think I failed the French paper.前者是我希望,后者是我想,为什么时态会不同? I feel sad because I failed the I failed the math test怎么读 i have failed again in the maths i failed the exam 同义句改写 what do you think make Mary so sad?___in the exam ,i thinkA.as she failed B.because of her failing C.failed D.failing I think they failed to accomplish the task,______?A.do I B.don't I C.did they D.didn't they I think the book_ I think I passed in English and mathematics.划出句子成分,比如说,I——主语（S.） think——谓语（V.）.这样的格式（格式不对不给分）还有几个句子（都是宾语从句）I hope I haven't failed.I think I failed the i tried ____ (open ) the door ,but i failed . 宾语从句中的谓语是否要和整句话（此宾语从句前的）谓语的时态保持一致?如：I think (that) I failed the exam. i thought i failed the test but i just found out i passed ,这里failed为什么不用过去完成时? I failed my math i failed u 连词成句:math,the,test,I,failed failed,I,Chinese,the,test (连词成句)