to be是从动词不定式to do过来的，就是把do换成be。to be其实是不定式的一种形式,to+动词原型构成动词不定式.这是非谓语动词用法的一种.
to be意思为将要 打算成为.
扩展资料
He aspired to be their next leade
To be 是不规则动词，须熟练掌握它的各种形式：
am , is , are , was , were , is being , has been , should be , could be , would be , might be , shall be , will be , can be , must be , need to be ...
它的其他形式用途主要有：
1. 系动词，相当于“是”
例如：The flower is red .
2. 表存在，
例如：China is in Asia .
3. 表判断（是/否），
例如：Are you there ? Yes , I am .
