为什么应该用I can not afford that expensive a computer而不用that an expensive computer

为什么应该用I can not afford that expensive a computer而不用that an expensive computer I can(not) imagine that they could (not) finish it in such a short time上面句子中的not 应该放在can后面还是could后面为什么? 口语小语法 1）有一句：I've got no small change.（何时用no）为什么不说：I haven't got small change.（何时用not）有什么不同?2）1.Can you...2.I can't3.Neither can I（语法是不是应该：I can neither?）So have I（ I can not hear something和I can not hear anything 那个对?为什么同题 I CAN NOT STAND I can not love I can not I can not sleep without thinking of you怎么解释,是不是说反了,应该用without吗? i can not tell her age .she could be ( )from 30 to 40为什么用anything I can not hear a word中为什么用a 不用any I can not sleep night before…为什么没有at? i shink i can not anyone和everyoneThis question is not very easy,I don't think_______ can work it out.A everyone B anyone应该选哪一个 为什么 i can not help clean the kitchen.i have to go now .这句话对么?中间应该...i can not help clean the kitchen.i have to go now .这句话对么?中间应该加个you啊?还有一句,he helped the old man out from the car,这个为什么要把fro I can not read 还是i can do not read 哪个对,为什么Can i do not read 还是 can i not read 哪个对，还有上面那个答案 说下哪个对， she can not play baseball 为什么要用can i can not stand 放so much salt into the soup 这个放应该怎么说 i can see some spoons ,but i can not see any knives .这句话中为什么knives 用复数?any 后面可以加复数吗?