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?