I need more time for my studies and have had to cut back on

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I need more time for my studies and have had to cut back on the outside 这个句子中为什么用have had to?

将 have had to 理解成 have to 的完成式,可译作：不得不.
再问：可是这个句子为什么要用完成时呢？
再答：看到 and 了吗！去掉它并还原全句，分别使用 have to 和 have had to，再看看能否理解两句之间的差异，或者说是区别在哪儿。

I need more time for my studies and have had to cut back on 英语翻译I have had my time on the street Been out there and neve I have had the time of my life and I owe it all to you. Now ,i spend more time on my studies than e___ before I'll go and have my hair to cut need,to,your,concentrate,more,on,studies,you(.) 翻译:I'm on my way back home to get my hair cut. 翻译Now that I have cut down on my habit,I am wasting more mon 英语翻译i had my hair cut off and sold it because i could't have I have just had my hair cut off and now it's____I was 18. I need time to figure out what on earth I need,can I curb my i need a ( ) for my books to put on