I can’t stand seeing my friend who is a confident person _______(lose)his heart.为什么填to lose ,为什么要加to.

问题描述:

I can’t stand seeing my friend who is a confident person _______(lose)his heart.
为什么填to lose ,为什么要加to.

to lose
who is a confident 是插入语对搭配没有影响
see sb to do 看见某人即将做某事

use to as an adverb

用to表明即将的意思
即将失去信心 /乱了方寸
整个句子:我不忍看见我那自信的朋友要乱了方寸
see sb doing 看见某人做某事
see sb to do 看见某人即将做某事

非谓语动词的用法,而非固定搭配。