I saw him reading/read just now为什么?
我刚看见他正在看书/我刚看见他看书.
see sb do sth 意思是看到某人做过某事,
see sb doing sth 意思是看见某人正在作某事
I saw him clean the room yesterday. 昨天我看见他打扫房间了。
I saw him cleaning the room yesterday. 昨天我看见他正在打扫房间
我刚看见他正在看书/我刚看见他看书.
see sb do sth 意思是看到某人做过某事,
see sb doing sth 意思是看见某人正在作某事
I saw him clean the room yesterday. 昨天我看见他打扫房间了。
I saw him cleaning the room yesterday. 昨天我看见他正在打扫房间