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 will arrive in good time.哪错了

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