weigh up to 400 grams,live up to 150 years old,grow up to be

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weigh up to 400 grams,live up to 150 years old,grow up to be 20 cm long
为什么第三个有be动词?

其实 grow up to 20 cm long
也对（去掉 be ）,
但 grow up to be 20 cm long
可以理解为
grow up to be (a) 20 cm long (object) 的省略句.
对两句子的差别我们不必过度纠结.
我是加拿大人,前英语老师.

weigh up to 400 grams,live up to 150 years old,grow up to be grow up to be为什么要加be,weigh up to就不要加be A tortoise can live _______ 150 years old.A.up to B.up at C. to be grow up is to be I’m going to live here__thirty years old.A.up B.to C.up to D I[ ]a dog can live up to 12 years old Only____people can live up to 100years old.And very_____peop I'm going to live here ____ thirty years old.A up B to C up how to grow up? weigh up to等于什么 live up to live up to its