he often thinks of ()he can do more for the four modernizati

he often thinks of 【how】he can do more for the four modernizations
he (主语）often（状语（ thinks of （谓语）【how】he can do more for the four modernizations（宾语从句）
i can't understand【why】they insist on going by motorbike
我不明白他们为什么坚持要骑摩托车去.
they insist on going by motorbike 这是个宾语从句.主谓宾齐备,显然从整个主从复合句来看,是缺一个副词why"为什么”,指“原因”
they （主语）insist on （谓语）going by motorbike （宾语）
------两个句子,我没看到哪个和定语从句有任何关系呀?!
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