1. 当主句谓语动词是find，see，watch，hear等感官动词时，从句常简化为“宾语＋宾补”结构，宾补为不带to的不定式或V-ing形式。如：

　　She found that the wallet lay/was lying on the ground. →She found the wallet lie/lying on the ground.

　　2. 当主句谓语动词是hope，wish，decide，forget，plan，agree等，且主句主语与从句主语相同时，从句可简化为不定式结构。如：

　　She agreed that she could help me with my maths. →She agreed to help me with my maths.

　　3. 在连接代词/副词引导的宾语从句中，当从句主语与主句主语或间接宾语一致时，宾语从句可简化为“连接代词/副词＋不定式”结构。如：

　　Can you tell me how I can get to the station？→Can you tell me how to get to the station？