sb.be seen doing sth.
eg. Andy was seen playing football.这里的意思是某人被看到正在做某事。强调某人被人看到了正在做某事。
sb.be seen to do sth.
这里要加to ,意思是某人被看到做了某事。强调做某事的过程被看到了。
不要to 直接就是 sb be seen doing sth 而不是 sb be seen do sth
应为是被看到正在做某事 突出动作正在做
某人被看到正在干某事翻译,我记得是用at 吧,不要to
sb is seen at doing sth
somebody be seen doing sth. 某人被看到正在做某事. 强调动作正在进行。
somebody be seen to do sth. 某人被看到做了某事,这里要用to. 强调过程,动作已经完成。
somebody be seen doing sth某人被看到正在做某事.
somebody be seen to do 某人被看到做了某事,这里要用to.