一道SAT语法题A recent report a(suggests that) safety-conscious dr

A recent report suggests that safety-conscious drivers need not limit themselves to driving large,heavy vehicles,because the structural integrity of a vehicle is more important than its size and weight.
这句话 正确 没有毛病
这里need not是情态动词 后面是动词原形 limit
不错 这是 limit oneself to doing.to是介词
这与need to doing好无关系 英语中也没有 need to doing
本句need如果是实义动词 应该是shouldn't need to limit

need是情态动词，不存在need to doing。这里limit是动词，意为限制，用法是limit sb to （doing）sth

不是need to doing，这句话里面是need做情态动词，后面跟动词原形。所以跟limit就是动词原形。
如果need是实意动词，就应该是do not need，后面应当跟to limit，跟doing就完全没有关系。
后面是limit sb to doingsth，因为to是介词。