一个简单的倒装句我造了个句子，意思是：羊就进来了，我写的是in came a group of sheep when it is rain，如果我要写羊进屋了，这个house放在哪里，如果是下雨了人进来了这么写对不对，in they came when it is rain，麻烦给看下

into the house came the sheep when it rains
the house放在into 和 came之间
in they came when it rains正确

倒装是一种语法手段，用于表示一定的句子结构或强调某一句子成分。倒装句有两种：完全倒装和部分倒装。
Here are your English book.
Here comes the bus.
这两句，因为主语不是人称代词，是明确的对象，所以主语，谓语的语序变了（这个是全部倒装，因为谓语在主语前面）。
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1.前半句对的，后半句改成“when it rained” 或者“when it was raining”.
2.羊进屋：Into the house came a group of sheep.
3.前半句对的，后半句改成“when it rained” 或者“when it was raining”.

So do I.

倒装句:
一下雨,羊就进来了:
In came a group of sheep as soon as it started to rain.
加上house的话:
Into the house came a group of sheep as soon as it started to rain.
一下雨,人就进来了:
In came a group of people as soon as it started to rain.
用they代替人的话:
In they came,as soon as it started to rain.