1将the Italy的the去掉,
2 根据句意,All the holiday应该为during the holiday,或者throughout the holiday；the writer thought about that send postcard to his friends这句话中将about去掉,因为think可以直接加宾语,that 后面是一个宾语从句,应该要有一套独立的句子成分（主谓宾）,所以send之前应该加一个主语he 后面再接一个情态动词should
3 until last day of his holiday有误,在序数词（比如first,second,last）的前面一般要加定冠词,表示特指,改为until the last day of his holiday
4.The writer made a big decision that he bought thirty-seven cards and whole day stied in room有误,应该在whole前面加the,根据句意stied应该改为stayed
4 But he did not write a single cards.有误,既然前面用了a,后面就没有必要用复数,a single cards改为a single card
第二篇
1 He has been abroad Australia six mouths改为he has been in Australia six mouths（既然这里明明写了Australia,就已经有abroad的意思了,没必要再重复了,此外Australia是一个地名,要加介词做表语）
2 he has been visited many place of Australia有误.主语he和谓语visit构成主谓关系,也就是主动关系了,没必要用been了
3 so he is very enjoying this trip.有误,表示喜欢,开心之类的意思时,是不能用现在时的,只能用一般时,改成so he enjoys this trip very much
第三篇
1 Mr.scott has opened his first garage in Silbury and lately he has opened another in Pinhust how is five miles from silbury.有误,根据阁下的意思,pinhust后面应该是一个定语从句,表示pinhust离silbury五英里,所以应该将改成which is five miles from silbury
Mr.Scoot ofen send many urgent message and requests spare part from one garage to the other有误,第三人称做主语,谓语用单数,所以send改成sends,既然用了many后面就该用复数messages,虽然message是一个抽象名词,但表示种类的时候可以用复数,所以后面的carried these message改成carried these messages