常見的搭配有smile at sb/sth，smile to oneself，smile on/upon，smile with等。
但smile to sb所見不多，甚至有詞典說是不可以，儘管也可以見到幾例。
《朗文當代高級英語辭典》第五版第2394頁smile詞條
Susan smiled at him and waved. 蘇珊朝他笑著揮揮手。
She had to smile at his enthusiasm (= she was amused by it).
他的熱情把她逗笑了。
I haven’t had much to smile about lately. 近來我沒什麼開心的事情。
smile to yourself
Mark read the message and smiled to himself (= smiled or felt pleased).
馬克讀著那條信息，笑了起來。
“I’m delighted to meet you.” George said, smiling at the girl.
“很高興見到你。”喬治笑著對那女孩說。
對某人笑是smile at someone，不要說smile to someone。
——這是該詞典明確所標出文字。
《劍橋高階英漢雙解詞典》第2105頁smile詞條
如果朝某人微笑，要注意在動詞後使用at。
She smiled at the little girl. 她朝那個小姑娘微笑。
She smiled to the little girl. （錯誤的用法）
When he smiled at me I knew everything was all right.
他衝我笑時，我就知道了一切正常。
He smiled to himself as he thought about his new girlfriend.
想到自己的新女友，他心中暗自發笑。
《韋氏高階英漢雙解詞典》第1975頁smile詞條
The photographer asked us to smile for the camera.
攝影師讓我們對著鏡頭微笑。
He smiled to himself (= he smiled or felt happy) as he looked at the photos.
他看著那些照片，開心地笑了。
She smiled at me. 她衝我微笑。
I had to smile at his silly comments. 對於他的愚蠢評論，我只能一笑了之。
smile on/upon (sb/sth)惠及；垂青
Fortune smiled upon us. (= we were lucky) 我們交了好運。
Lady Luck smiled on me and I won the jackpot.
我得到幸運女神的垂青，贏了頭獎。
《英語搭配大辭典》（王文昌主編）第1555頁smile詞條
smile (up)on…向…微笑；對…加以青睞
She smiled on him. 她向他微笑。
Fortune smiled on us. 我們交好運了。
The weather smiled on us; it was a fine day. 那天天公作美，晴空萬里。
She smiled to me from her window. 她從窗口向我微笑。
——本條例句不易模仿。
《葛傳槼英語慣用法詞典》第538頁smile詞條
說“對（某人）微笑”在smile後面接at, on或upon都可以。
He smiled at（或on，或upon）me. 似乎用at最普通。
《牛津英語搭配詞典》第1443頁smile詞條
smile at朝…微笑
He turned and smiled at me. 他轉過身朝我笑笑。
smile with因…而笑
She smiled with pleasure. 她高興地笑了。
smile to oneself 暗笑
She smiled to herself, picturing how surprised her mother would be to see her.
一想到母親見到她時會有多驚訝，她就暗自笑起來。
《朗文高階英漢雙解詞典》（新版）第2143頁smile詞條
smile to yourself暗笑；偷著笑
Mark read the message and smiled to himself.
馬克一邊讀信息，一邊暗自發笑。
儘管有以上例句，還是不建議使用smile to sb，smile at sb, smile to oneself, smile on/upon sth (sb少用，高考英語閱讀已有出現）為好——畢竟“高考英語是個有決定性的考試”。
2017年9月7日
