"food and shelter are necessities of life" "the essentials of the good life" "allow farmers to buy their requirements under favorable conditions" "a place where the requisites of water fuel and fodder can be obtained"
"the necessary consequences of one's actions"
误 I am necessary to finish my homework before seven o'clock.
正 It is necessary for me to finish my homework before seven o'clock.
析 表示“某人必须做某事”时,须用It is necessary for sb to- v 结构。
