在什么情况下现在进行时可以省略be动词。或者是必须省略？现在分词做后置定语，可以省略，The boy sitting over there is my younger brother 现在分词做宾语补足语可以省了，we saw a thief stealing wallet from an old lady现在分词做主语补足语可以省例如，The boy is seen playing near the river...
现在分词做后置定语，可以省略，The boy sitting over there is my younger brother 现在分词做宾语补足语可以省了，we saw a thief stealing wallet from an old lady现在分词做主语补足语可以省例如，The boy is seen playing near the river...
