lovely可爱的 虽然是ly结尾，但是形容词。而 lovingly 亲切地 是副词。

She spoke to the child lovingly.（不能用lovely）

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副词一般由形容词后面加ly，

比如：   slow-> slowly,  interesting -> interestingly.

如果形容词由y结尾，则y要变i再加ly ，比如： happy-> happily

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 有些副词并不是以ly结尾。比如：

good -> well , 下面这些，和形容词一样。fast -> fast，还有 hard, early, late, far, long, short, straight, fine等

注意hard 和 hardly都可以是副词，但意义不一样。

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 有些单词以ly结尾，但是并不是副词，而是形容词。比如： lovely, friendly, lonely, orderly, silly , lively , deadly,  timely.

你不能把这些形容词变成副词。但可以加上 way / manner / fashion来描述一个动作。

比如： She was lovely. -> She welcomed us in a lovely way/manner/fashion.

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有些单词以ly结尾，可以是形容词，也可以是副词。比如： weekly, monthly, daily, yearly.

 It's a weekly magazine. -> I receive it weekly.

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有一些口语里，有时用形容词来代替instead of 副词。比如：

That was real nice.
Come quick!
The computer is running slow today.
He doesn't speak loud enogh.

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 在linking or sense verbs时，要接形容词，而不是副词。具体请看> ，

比如： The situation seemed unusual.

Your garden looks beautiful.

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不能用形容词来修饰一个动词，或一个形容词或一个副词。

He sings well. （不能用good）

He's a wonderfully good singer, （不能用 wonderful修饰good）

He sings incredibly well. （不能用 incredible 修饰 well）

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加不加ly，都是副词，但意义不一样。

比如hard, hardly, short, shortly, late, lately.

 I hardly know hime. = I don't really know him.  (  hardly = almost no 几乎不 )
He's a hard worker. -> He works hard.

 I haven't seen her lately(最近). = I haven't seen her recently.
The bus was late. -> I arrived home late.

I'll call you back shortly（不久）. = I'll call you back soon.
It was a short speech. | He cut his speech short.

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