see sb do sth是看到某人做某事,see sb doing sth是看到某人正在做某事.
eg:I see my grandfather have a beatific smile.
I see my sister singing song in her room.
see sb do sth是看到某人做某事,see sb doing sth是看到某人正在做某事.
eg:I see my grandfather have a beatific smile.
I see my sister singing song in her room.