Ithinkitisnecessaryformy19-year-oldsontohavehisownmobilephone,forIsometimeswanttomakesureifhehomefordinner.A.comesB.willcome为什么选b不选a,后半句做什么成分,并且为什么不是主将从现,

Question

I think it is necessary for my 19-year-old son to have his own mobile phone,for I sometimes want to make sure if he______home for dinner.
A.comes B.will come
为什么选b不选a
,后半句做什么成分,并且为什么不是主将从现,

Answer 1

后半句是条件从句.
for 这里的意思是 '因为',如:
I was late,for I was stuck in traffic.我迟到了,因为堵车.
这里说 'will come' (B) 是因为他来不来吃饭还没有发生,不是现在的事,是以后会(或不会)发生的事,所以是 B.
清楚了吗?