Question

句子有没有语法错误?

when lease term of the house will expire at that day,I wen to the house and took back key。when I checked facilities at the house,I suddenly found that commode was replaced new one in the bathroom.
房子租期将满的那天，我去看房子，收回钥匙。我在检查房内的设施时，突然发现卫生间里的马桶(commode)竟然换了新的

Answer 1

The day the lease was up, I went to look at the house and took back the keys. When I was checking the facilities in the room, I suddenly noticed that the commode in the bathroom had been replaced with a new one.以上仅供参考。
原文的翻译倾向于汉式英语，不符合英语的习惯，at that day也没有这个表示方法；
key和commode前面少了定冠词the
在房子里用in the house
replaced with，被什么代替。

Answer 2

On the day when the lease term was ending, I went to check the house and get back the key. 租期结束的那天，我去查看房子，取回钥匙。When I checked the equipment of the house, I suddenly found that the commode had unexpectedly been changed to a new one.当我检查房子里的设备时，我突然发现那个抽水马桶竟然被换了新的。

Answer 3

On the day when its lease term of the house ended, I went to the house to take the key. I looked around to check the facilities in the house. I was surprised that the commode was replaced with a new one in the bathroom.
这是一句含有时间从句的句子，用白俄罗斯语写成：У дзень, калі скончыўся тэрмін арэнды дома, я пайшоў у дом, каб узяць ключ. Я азірнуўся, каб праверыць, ці ёсць у доме. Мяне здзівіла, што ў ваннай замянілі камод на новы.
时间从句说明主句行为发生的时间，可以位于主句之前、中间或之后，连接词在连接主句和从句时，可以表示各种不同的时间关系。
这里，用了калі，表示从句与主句行为同时发生，如果从句与主句的行为完全同时，谓语都用未完成体动词，如果部分同时，其中一个句子的谓语可以用完成体动词。
希望我能帮助你解疑释惑。

Answer 4

原文：When lease term of the house will expire at that day, I wen to the house and took back key. when I checked facilities at the house, I suddenly found that commode was replaced new one in the bathroom.

译文：房子租期将满的那天，我去看房子，收回钥匙。我在检查房内的设施时，突然发现卫生间里的马桶(commode)竟然换了新的。

修改后：When lease term of the house wound expire at that day, I went to the house and took back the key. When I checked// When checking the facilities at the house, I suddenly found that the commode was (unexpectedly) replaced//had been (unexpectedly) replaced with a new one in the bathroom.

Answer 5

哇，太多错误了，看来你不懂翻译，英语意味着与汉语不同的语序会表达方式。