常见的搭配有smile at sb/sth，smile to oneself，smile on/upon，smile with等。
但smile to sb所见不多，甚至有词典说是不可以，尽管也可以见到几例。
《朗文当代高级英语辞典》第五版第2394页smile词条
Susan smiled at him and waved. 苏珊朝他笑着挥挥手。
She had to smile at his enthusiasm (= she was amused by it).
他的热情把她逗笑了。
I haven’t had much to smile about lately. 近来我没什么开心的事情。
smile to yourself
Mark read the message and smiled to himself (= smiled or felt pleased).
马克读着那条信息，笑了起来。
“I’m delighted to meet you.” George said, smiling at the girl.
“很高兴见到你。”乔治笑着对那女孩说。
对某人笑是smile at someone，不要说smile to someone。
——这是该词典明确所标出文字。
《剑桥高阶英汉双解词典》第2105页smile词条
如果朝某人微笑，要注意在动词后使用at。
She smiled at the little girl. 她朝那个小姑娘微笑。
She smiled to the little girl.（错误的用法）
When he smiled at me I knew everything was all right.
他冲我笑时，我就知道了一切正常。
He smiled to himselfas he thought about his new girlfriend.
想到自己的新女友，他心中暗自发笑。
《韦氏高阶英汉双解词典》第1975页smile词条
The photographer asked us to smile for the camera.
摄影师让我们对着镜头微笑。
He smiled to himself (= he smiled or felt happy) as he looked at the photos.
他看着那些照片，开心地笑了。
She smiled at me. 她冲我微笑。
I had to smile at his silly comments. 对于他的愚蠢评论，我只能一笑了之。
smile on/upon (sb/sth)惠及；垂青
Fortune smiled upon us. (= we were lucky) 我们交了好运。
Lady Luck smiled on me and I won the jackpot.
我得到幸运女神的垂青，赢了头奖。
《英语搭配大辞典》（王文昌主编）第1555页smile词条
smile (up)on…向…微笑；对…加以青睐
She smiled on him. 她向他微笑。
Fortune smiled on us. 我们交好运了。
The weather smiled on us; it was a fine day. 那天天公作美，晴空万里。
She smiled to me from her window. 她从窗口向我微笑。
——本条例句不易模仿。
《葛传槼英语惯用法词典》第538页smile词条
说“对（某人）微笑”在smile后面接at, on或upon都可以。
He smiled at（或on，或upon）me. 似乎用at最普通。
《牛津英语搭配词典》第1443页smile词条
smile at朝…微笑
He turned and smiled at me. 他转过身朝我笑笑。
smile with因…而笑
She smiled with pleasure. 她高兴地笑了。
smile to oneself暗笑
She smiled to herself, picturing how surprised her mother would be to see her.
一想到母亲见到她时会有多惊讶，她就暗自笑起来。
《朗文高阶英汉双解词典》（新版）第2143页smile词条
smile to yourself暗笑；偷着笑
Mark read the message and smiled to himself.
马克一边读信息，一边暗自发笑。
尽管有以上例句，还是不建议使用smile to sb，smile at sb, smile to oneself, smile on/upon sth (sb少用，高考英语阅读已有出现）为好——毕竟“高考英语是个有决定性的考试”。
2017年9月7日
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