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Everything that has happened has a cause.
Everything is caused.(I prefer this one)

everything that happened has its cause

回复3楼:+1

everyything happened has a caused 你时态　从句谓语形式都不对

是cause

能否合成一句话

所有事情的发生都有它的起因

嗯嗯 能帮我指出哪里不对么 谢谢

回复9楼:Everything is caused.

我想表达的是 所有事情的发生都有它的原因 这句中文 谢谢

你时态　从句谓语形式都不对

everything happened that it have cause
首先,第三人称用单数,所以have不对, 应该是has
everything 是主语, happened是定语,可以在everything 和 happened的中间加that,也可不加,但你that的位置不对,it也没用
所以可以直接说, everything happened has a cause(名词 单数cause前面要有冠词)