They can tell their love for each other was true

问题描述:

They can tell their love for each other was true
who can help me to analyze this sentence,and the meaning of it Thanks so much

他们明白他们之间过去的感情是真的.
tell有判断 断定 看出 区分 辨别 识别的意思.
当主句是一般现在时,宾语从句可以使任意时态,was表过去