"你确实是个好孩子" 用英语怎么说........

you are really a excenllent kid

以上诸位翻得都对，但是没有人这么说。
就像我们不会说“吾儿甚佳”之类。
一般就说: That's a good boy & That's a good girl.

you really are a good kid

You are a good child indeed.

You are a good kid indeed.

Or, you are indeed a good kid.

建议选四楼"血燕子"同学的