We haven’t settled the question of _______ it is necessary for him to study abroad.为什么用whether不用if3Q~

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We haven’t settled the question of _______ it is necessary for him to study abroad.
为什么用whether不用if
3Q~

因为后面有to study whether to do是短语

只用whether不用if的情况
后面or not 或to do 前面就用whether(或有明显的选择口气时 )
前面是介词 后面就whether
句首用whether(主语从句)
is后跟whether(表语从句)

因为前面是介词of