请英语高手帮我看看有没有语法错误，无尽的感谢！！！

Question

1.去正式的场合一定要穿西装打领带。
Make sure you wear a suit and tide when you come to a formal occasion
2.人们没有传真时广泛应用电报
The telegraph are often used wide when the electrograph have not been invented.
3.人类没学会烧制食物的时候吃的是生肉。
The raw meat is ofen ate when the human races didn't know how to cook food.
4.如果你有提高效率的新想法，你最好提出建设性的建议。
If you have a productive thinking ,you 'd better give a constructive advise.
5.现在，乒乓球已经发展成为奥林匹克比赛项目。
Nowaday,table tennis has become an competition item in Olmypic game .
6.现在，中国书法已经成为宝贵的传统艺术宝库。
Nowaday ,Chinese calligraphy has aready become a precious traditional art.
7.不然的话，顾客可能会失去对我们产品的兴趣。
Otherwise,it is likely that the clients will lost the interest in our products.
8.不然的话，他会把所有时间都花在这种无用的游戏中
Otherwise ,it is likly that he will spend all of the time in this unuseflul game .

Answer 1

2.The telegraph are often used widely when the electrograph have not been invented.
3.when human beings didn't know how to cook food, they ate raw meat.
4.You'd better give a constructive suggestion if you have an idea about enhancing the efficiency.
5.Nowadays , Table tennis has become an event in the Olmypic Games.
7.Otherwise, clients may lose their interest in our products.
8.Otherwise , he will spend all the time playing this useless game .

Answer 2

2. Telegraph had been widely used before the fax was invented.副词修饰动词，所以要用widely，而不是wide
3.前后时态有点混乱，都用过去式
4.productive thinking ？？？提高效率的新方法能这样翻译吗，我好像没见过。
5.开头应该用nowadays而不是nowaday.前者是副词，后者是形容词。比赛项目应该用event而不是item。奥林匹克比赛是专有名词，前面加定冠词the，game 首字母要大写。
第七句很别扭，建议用虚拟语气。
第八句同上

Answer 3

随便看了看，明显的错误一堆，要是仔细推敲可能会有更多错误。

Answer 4

我觉得语法上没有错误
但是如果你仔细推敲的话，句子会更完美！

Answer 5

很多