find sb do sth 一种状况,反复发生的事情
Find sb doing sth.发现一种动作正在进行
I find him drink a cup of wine every day.我发现他每天喝一杯酒.
I find him drinking a cup of wine.我发现他正在喝一杯酒.
find/notice/see有以上相同的用法.
他发现自己忘了带钱包：He found that he forgot his wallet