"小伙子"是指年轻男性，可以用英文表示为 "young man" 或 "lad"。
"对自己说" 可以用英文表示为 "talk to oneself"。
所以，"小伙子对自己说英语" 可以用英文表示为 "a young man talks to himself in Engpsh" 或 "a lad talks to himself in Engpsh"。
例句：
The young man was muttering to himself in Engpsh as he walked down the street.
I couldn't help but overhear the lad talking to himself in Engpsh as I walked by.
翻译：
这个年轻男子在街上喃喃自语，说的是英语。
我无意中听到这个小伙子在英语中自言自语，我就走了过去。
"对自己说" 可以用英文表示为 "talk to oneself"。
所以，"小伙子对自己说英语" 可以用英文表示为 "a young man talks to himself in Engpsh" 或 "a lad talks to himself in Engpsh"。
例句：
The young man was muttering to himself in Engpsh as he walked down the street.
I couldn't help but overhear the lad talking to himself in Engpsh as I walked by.
翻译：
这个年轻男子在街上喃喃自语，说的是英语。
我无意中听到这个小伙子在英语中自言自语，我就走了过去。