The verb 'see' seems to have many uses:<br/><br/>1. I saw Peter run away.<br/><br/>2. I saw Peter running away.<br/><br/>Besides, 'see' can be followed by a that-clause.<br/><br/>3. I saw (that) Peter ran away. / I saw Peter ran away.<br/><br/>The third one seems to be incorrect, but isn't it grammatical?<br/><br/>Thank you for your help!