observe do 、doing sth 变被动的时候He observed a man go/going into the bank.（go全过程,going正在进行）被动时要把to补出来 下面两句话都对吗,如果不对,为什么?A man was observed to go into the bank.A man was observed

observe do 、doing sth 变被动的时候He observed a man go/going into the bank.（go全过程,going正在进行）被动时要把to补出来 下面两句话都对吗,如果不对,为什么?A man was observed to go into the bank.A man was observed
observe do 、doing sth 变被动的时候
He observed a man go/going into the bank.（go全过程,going正在进行）
被动时要把to补出来 下面两句话都对吗,如果不对,为什么?
A man was observed to go into the bank.
A man was observed to going into the bank.

observe do 、doing sth 变被动的时候He observed a man go/going into the bank.（go全过程,going正在进行）被动时要把to补出来 下面两句话都对吗,如果不对,为什么?A man was observed to go into the bank.A man was observed
第一句对；第二句不对,要去掉to
应为：A man was observed going into the bank.
感官动词see,watch,smell,notice,observe等在主动语态时后接动词do或者doing
observe sb do sth-------------被动式为sb be observe to do.
observe sb doing--------------被动式为sb be observe doing.

第二句话不对，在这句话中TO后面跟动词原形，只有当TO做介词是才能跟动名词 ，应把to去掉。第一句完全正确。

第二句应该变成A man was observed going into the bank.
因为observe do 其实是省略了to
即observe to do
变被动的时候要加上，不过doing就不用了