If they left now,they will arrive in good time.哪错了

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If they left now,they will arrive in good time.哪错了

If they left now,they would arrive in good time.
从条件从句看,“如果他们现在离开”,用一般过去时,表示与现在事实相反,又因为结果主句的主语是they,那么应该用would+动词原形的形式,用虚拟语气.
与现在事实相反的虚拟语气的规则是:
条件从句形式为:If (we,you,she/he,they)+动词过去式(be用were)
结果主句形式为:I(we)should
You would
She/he would + 动词原形
They would

If they leave now,they will arrive in good time.

They will arrive on time if they leave now :)

前面用了过去式 后面就不能用将来时了
要么是 If they left now,they will arrive in good time
或者是 If they left now,they would arrive in good time
注意 主将从现