what are they going to catch
这句话的意思是他们要去抓什么。 这是一个特殊疑问句，句中用到了将来进行时，他们将要去做什么用be going to do来表述，就是将要做某事。...
TAG：what are they
what are they doing和what they are doing的区别
这两个句子的区别是：句型不一样，用法就不一样。 What are they doing?是由特殊疑问词What+一般疑问句构成，所以是个特殊疑问句，意思是“他们在干什么？”回答为：They are doing…他们在(做……) What they are doing是由what+陈述句构成，因此是what引导的主语从句或宾语从句，如： What they are doing is good for the country and people.他们做着的事利国利民。(what引导的主语从句)...