clumsy birds have to start flying early

clumsy birds have to start flying early Clumsy birds have to start flying Some birds live in cool places in spring start flying to war We have to start early,don’t we?请问这里的have是实义动词吗 这句话有语法错误吗?we have to start out early to catch the first bus we must start early,____ we have a long way to go we must start early,____we have a long way to go.Abecause Bf We must start early,_____ we have a long way to go.A.because 小学英语问答:Flying birds Early birds catch Early birds catch worms early birds in china