英语语法要有详细解释Modal verb1.Don’t be in a hurry to buy a computer.

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英语语法
要有详细解释
Modal verb
1.Don’t be in a hurry to buy a computer. You’ll________________(buy) one much cheaper next year.
2.I haven't been able to sleep very well recently.
3.I used to be able to stand on my head,but I can't do it now.
4.Ask Catherine about your problem.She might be able to help you.
5.We are able to see the lake from our bedroom window.
第2,3,4,5句为什麼都用be able to 能解释一下吗?

1.be able to
不要急着买电脑,明年你能买到更便宜的.
can没有将来时,所以要用be able to
2.2345句用be able to,
第二题是因为can只有过去式could,不能用在完成时中.
第三题是因为used to是情态动词,can也是情态动词,两者一般不可以连用
第四题同理
第五题我认为也可以用can

They___the computer.A.don't need buy B.needn't to buy C.don' be in a hurry to do sth. be in a hurry I don't have enough money to buy a computer.读句子,写出你的忠告 I don't have enough money to buy a computer ( ) 读句子,写出你的忠告 I don't have enough money____(buy)a computer. 英语翻译to make a modal verb negative you use don't. You don't have to come in such a hurry .I'm busy now ,and I be 和in a hurry 改为同义句.1.I don't have money to buy a computer.I _____ _____ m 用be in a hurry to do sth 造句 hurry to do等于be in a great hurry to do吗