-What kind of apartment are you looking for?- It has to be cheap.It has to be cheap.为什么加be

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-What kind of apartment are you looking for?- It has to be cheap.It has to be cheap.为什么加be
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-What kind of apartment are you looking for?- It has to be cheap.It has to be cheap.为什么加be
-What kind of apartment are you looking for?- It has to be cheap.
It has to be cheap.为什么加be

-What kind of apartment are you looking for?- It has to be cheap.It has to be cheap.为什么加be
be就是系动词,形式为am,is,are,如果没有has to,那就是It is cheap;
has/have to意思为:必须,不得不
大多数不定式(to)后面要加上 动词原形,而这里面的动词是是系动词,原形就是be.

It has to be cheap.=it must be cheap.have to = must

has to do 是个固定句式。没有has to,会是:It is cheap,有了has to,is就必须改成原型do咯~

cheap是形容词,所以要用be动词与主语方面连接

has to在这里意思等于中文的“必须”,It has to be cheap整句话翻译过来就是“要便宜的”。
所以句子真正的结构是It is(be) cheap,主系表结构。
has to只是附加起强调作用而已。