This sentence contains a verb tense error; travelers will plan a trip ... if time would be set aside is not a correct construction. A future action that is certain (travelers will plan) must depend on a present tense condition; time would be is conditional, and the correct answer will be in the present tense. In addition, the phrase separately spontaneous does not make sense and should be changed.
only if + would be表示虚拟语气,这里不需要虚拟;separately修饰了spontaneous错误
would be 引导的将来时虚拟语气与语境不符
非虚拟语气,将来虚拟语气格式为:if 从句+should /were to+do;main clause+would/should/could/might/will+do
X will do something only if Y does something else. 主将从现
A will do something (only) if B does something 主将从现 A,D,E排除
1)-X will do sth only if Y does sth. 杀!2)-only if=as long as,引导条件状语从句, if only才引导虚拟语气。
only if + would be表示虚拟语气,这里不需要虚拟;separately修饰了spontaneous错误
only if + would be表示虚拟语气,这里不需要虚拟;separately修饰了spontaneous错误
would be 引导将来时的虚拟语气,与原句时态不符
if only后接虚拟语气,only if后接一般现在时
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