a group of birds 单数还是复数？

a group of birds  单数还是复数？

a group在句子中是一个种群的意思，不是表示单位“一群”

h.a body of/an array of/a series of/a collection of/ a set of /the number of +n/ns +谓语单数
        

顺便帮你补个知识点，抄袭自800分牛牛的语法总结

my two cents:   group of birds  是复数

Many singular quantifying expressions can be used with plural nouns and pronouns; plural verbs are normally used in this case.

A number of people have tried to find the treasure, but they have all failed.   (More natural than A number of people has tried...)

A group of us are going to take a boat through the French canals.

A couple of my friends plan to open a travel agency.  (NOT A couple of my friends plans...)

A lot of social problems are caused by unemployment.  (NOT A lot of social problems is caused...)

The majority of criminals are non-violent.

Some of these people are relations and the rest are old friends.

Half of his students don't understand a word he says.  (NOT  Half of his students doesn't....)