书上有句话：This has become the model of a successful life.句中的become为什么不是became

书上有句话：This has become the model of a successful life.句中的become为什么不是became She has been in this school for 3 years already.这句话有语病没 this summer has gone like the cloud 这句话有错误吗? This is the book for which he is looking 这句话正确吗?有书上说look for这样的词组不可分开,可应用书上有This is the book for which he is looking这个例句,糊涂了, 这句话有语法错误嘛→_→nothing can convince her this truth that her father has dead 请翻译this parrot has ceased to be这句话 This house has been built 200 years ago.请问这句话中‘‘has been built’’ pockets of 意思麻烦告诉我pockets of的含义,我初步理解是 几口袋的 但是感觉不太通顺,似乎有更好的翻译方式才对,原句：We're not just seeing pockets of talent - it is clear that Asia as a whole has emerged to becom He came from a poor village in the first place,but now he has becom a famous writer.的同意句 英语翻译我的MP3说明书上有这句话, 英语翻译I've seen you.students have started gossiping,they say that this boy and I have fallen in love,this has made me angry.（这句话里面加不加have,意思上有什么区别?） 这句话有to this day 却为什么没有用完成时?To this day there is no evidence that the disease is spread by mosquitoes.为什么不用there has been?求解释 she has emptied the basket this morning为什么不是现在完成时?书上说是一般过去式,但是怎么也应用了has+done的形式 How long has this factory been open这句话转变成这样可以吗How long has been factory open 书上这句话: _ has an eraser .This is her eraser .横线上天什么 这句话的翻译 This food processor has a special attachment for grinding coffee.这句话怎么翻译? _ has an eraser .this her eraser 横线上填什么 这句话的翻译