英语翻译1 开车时系好安全带,注意安全 .车速要适当,不要太快了2 那个男孩正低着头,在玩手机3 这是Tom 写给你的信

1.fasten the safety belt when driving,safety first.Due to the speed,not too fast.
2.the boy is low head,playing mobile phone.
3.this is the tom letter for you,after please write back to him.
4.you have received his letter for you now..
最后一句为什么要加括号?
里面大小写自己改.
再问： 打错，括号了。呵呵。。。谢谢
再答： 不客气.