1.若主句为I （we） think（believe,suppose,consider）＋that
若主句为I （we） think（believe,suppose,consider）＋that从句时,问句部分的助动词和主语与that从句内的动词和主语保持一致.
例句：I think that he has done his best,hasn't he?
2.若主句为I （we）don't think（believe,suppose,consider）＋that从句时
若主句为I （we）don't think（believe,suppose,consider）＋that从句时,从句为否定意义,问句部分的助动词和主语仍与that从句保持一致,用肯定形式.
例句：I don't think that you can do it,can you?
3.若主句为非第一人称主语
若主句为非第一人称主语＋think (believe,suppose,consider)+that从句时,问句部分的助动词和主语与陈述部分的助动词和主语保持一致.
例句：They all think that English is very useful,don't they?
