you certainly do not know ,I think you when he came to tear .you certainly do not know ,I think you when he came to tear 谁知道.

you certainly do not know ,I think you when he came to tear .
you certainly do not know ,I think you when he came to tear 谁知道.

你肯定不知道,当他开始哭的时候我想的是你.
这是初中生水平的chinglish吧?用词语法全不对.

你不知道是当他在我面前哭得时候我却想着你.

你当然不知道,我想你当他来到了眼泪

这个句子是个错句子，混乱