不是进行时态,是表将来要做什么的将来时。
表示将要发生的事、将要去做某事
如:He is going to write a letter tonight.
be going to 表示根据主观判断将来肯定发生的事情
He is seriously ill. He is going to die.
be going to 含有“计划,准备”的意思
She is going to lend us her book.
在有条件从句的主句中,一般不用 be going to, 而多用will, 如:If any beasts comes at you, I'll stay with you and help you.
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