or在作“也不”解時通常用于否定句; 作“還是”解時常用于疑問句。

　　The operation could prolong his life by two or three years.

　　這次手術可使他多活兩三年。

　　She always had one or two students boarding with her.

　　她的家總有一兩名寄宿學生。

　　How much will it cost, more or less?

　　這個大概得花多少錢？

　　Is this a social visit, or is it business?

　　這是社交性的拜訪，還是業(yè)務性的？

　　I could come next week, or the week after.

　　我可能下周來，或者再下一周。