If he is not at home ,I will call him tomorrow为什么只能用will不能用be going to do sth?

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If he is not at home ,I will call him tomorrow为什么只能用will不能用be going to do sth?

原句采纳了if条件句,那么根据“主将从现”的原则,主句采用一般将来时的模式,有不确定因素在其中.
而be going to do “打算做.”主观意思较强.
又如:if it's fine ,we will have a picnic.天气好的话,我们去野餐.

be going to do sth是好要做某事,而这个句子是If引导的条件状语从句,具有不确定性,谈不上计划或安排