see、watch、observe、notice、look at、hear、listen to、smell、taste、feel+do表示动作的完整性，真实性；+doing 表示动作的连续性，进行性。
1.感官动词+宾语+动词，表示经历事件的完整过程
例句1：They knew her very well. They had seen her grow up from childhood.
他们非常了解她。因为他们是看着她从小孩子到长大成人的。
例句2：I saw him work in the garden yesterday.
昨天我看见他在花园里干活了。
2.感官动词+宾语+动词ing,表示动作正在进行，经历事件的部分过程
例句1：The missing boy was last seen playing near the river.
迷失的小男孩最后被发现正在河边玩。
例句2：I saw him working in the garden yesterday.
昨天我见他正在花园里干活。
