宾语从句
表示“坚持说；坚决认为(多与别人的观点不同)”,接that从句(从句的动作多为已发生之事),从句使用陈述语气.如：
She insisted that he was wrong.
她坚持认为他错了.
虚拟语气
表示“坚决主张；坚持要求”,接that从句(从句的动作为将要发生之事),谓语多为 should型的虚拟语气,即：主语+ should(可省略)+动词原形.如：
He insisted that we (should) accept these gifts.
他一定要我们收下这些礼物.
Jane insisted that he be present.
简坚持要他出席.
还可用于“insist on / upon + 名词或代词或 动词-ing形式”结构中.如：
He insisted on / upon my going with him.
他坚持要我跟他一起去.(= He insisted that I [should] go with him.)
I insist on seeing it.我一定要见到它.(= I insist that I see it.)
Ⅲ.if you insist 常用于口语中,表示勉强同意.如：
All right,I’ll do it,if you insist.
好吧,如果你一定要我干这事,我就去干
希望帮到lz
