see sb do sth和see sb doing sth具体区别?saw sb do sth不也是“看见过某人做了某事”么?具体在英语中怎么用?

see sb do sth和see sb doing sth具体区别?
saw sb do sth不也是“看见过某人做了某事”么?具体在英语中怎么用?

感官动词 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
I saw him work in the garden yesterday.
昨天我看见他在花园里干活了.(强调"我看见了"这个事实,或者是全过程)
I saw him working in the garden yesterday.（强调"我见他正干活"这个动作）
昨天我见他正在花园里干活.

see sb doing sth 是正在进行

see sb doing sth 是说看到某人正在做某事 强调看到的动作正在进行

see sb doing sth是看见某人【正在】做某事