① If you are free 如果妳有空
② If you are available (這種方式在電影裏很常見的)
Are you available now?
妳現在有空嗎?
③ If you have time
If you have time, you can come to my office.
如果有時間,妳可以來我的辦公室。
④ If time permits 如果時間允許
We hope to visit the Cathedral,if time permits. (牛津詞典的原句)
⑤ If you are at leisure
I am seldom at leisure. 我很少有空閑。《新英漢大辭典》
第⑤種應該很少用,在牛津詞典上有壹個是 at your leisure 意思是有空時,空閑時,是壹種正式用語。更強調的是空閑,所以還是建議用前幾種吧,最後壹條純屬建議,慎用。