在不少地方看到过，动词go和come习惯上不与be going to连用，如习惯上不能说be going to go，遇到这类用法，直接用be going to / be coming to，如

不说：You aren’t going to go to her birthday party, are you?

而说：You aren’t going to her birthday party, are you?

但我今天在一本书看到这样两个句子：

Where is she going to go? 她准备到哪里去?

I’m going to go away. 我准备离开。

Mummy is going to come with me. 妈打算和我一道去。

请各位老师指点！谢谢！