形容词的宾语从句中,形容词后if,whether是否都可用?如I am not if sure I will pass the exam.和I am not sure whether I will pass the exam.是两个都能用还

问题描述:

形容词的宾语从句中,形容词后if,whether是否都可用?如I am not if sure I will pass the exam.和I am not sure whether I will pass the exam.是两个都能用还是只能用其中之一?

只能whether