请问一下，以下几个英语句子有没有语法错误，谢谢！

Question

With the help of the police dogs,policemen can find out the criminals early.
These two girls are chatting joyfully,because they are wearing cheerful smiles.
Dogs are amicable.

Answer 1

With the help of police dogs,policemen can find out the criminals earlier.
These two girls are chatting joyfully,as cheerful smiles on their faces.
Dogs are amicable.
希望能够帮助到您追问

第一个句子early必须变成比较级吗？句首能不能加上There is no doubt that?
第二个句子能不能说一下as……在这里是什么用法？

追答

There is no doubt that....是无需置疑的意思 可以加在前面，变成比较级的形式主要是为了强调警犬可以帮助更快找到罪犯。

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