I don't know 后面为何可以跟what to do而不可以跟how to do?

如题所述

应该说what to do中what是do的宾语,因此后面不能再接宾语而在how to do中how是修饰动词do的,所以do后面应该再加上宾语的,比如I don't know how to answer the question I don't know what to do next
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