it 's difficult for children in the poor area to cross the r

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it 's difficult for children in the poor area to cross the river.yes,that 's trre ,
there should be a bridge over the river.请问这个句子中be 情态动词后要跟动词原形,可为什么都是跟be 比如 do you like the coffee?it's very nice ,but it will be much better with some milk in it.这句里的be 呢

e也是动词的一种,叫做状态系动词,是状态系动词is和are 的原形.情态动词后应该跟动词原形,本来正常时态（一般现在时）的句子应该是There is a bridge over the river.用should是想要表达应该有的意思,所以在原句基础上加上should,变为There should is a bridge over the river,但是因为情态动词后面要跟动词原形,所以就要把is变成它的原形be.第二句也是同理,本来原句是it is much better with some milk in it,但是是要表达将来的意思,翻译过来就是,加些牛奶它（咖啡）将会更好一些,所以就变成it will is much better with some milk in it.同理will后面要跟动词原形,所以要把is变成原形be.

it 's difficult for children in the poor area to cross the r It’s difficult for the village children to cross the river t have you decied ----the children in the poor area? -have you decided___the children in the poor area?-by sendin It's really difficult to _____(education) the children well. She found it difficult to sustain the children's interest. 3.In the old days it was difficult for the poor ____ a job. 单选 in the old days it was difficult for the poor ________ a 一道初中英语填空题In the old days it was difficult for the poor ( ) a A lot of money was spent ____ the poor children in poor area 68.It's impossible for him to finish the difficult task in s it's difficult for him to finish the work in half an hour.同义