This is acceptable when, for example, you sign onto your bank's Web site.
例如，在登录银行的网站时这是可以接受的。
When, for example, would Mr Romney bring the troops home from Afghanistan?
举例说，罗姆尼先生何时才能把在阿富汗的士兵们接回家？
When (for what point in time) does the data need to be recorded?
何时(哪个时间点)需要记录数据？
We just don't know "when" for sure.
只是我们不确信是什么时候。
When, for instance, we hit a nail with a hammer, we expect the nail to move.
比如，当我们用锤子敲打钉子时，我们可预知钉子要移动。
Have you ever been to the U. K.? When? For how long?
是否曾到过英国？何时？逗留的时间？
Have you ever been to the U. K.? When? For how long?
是否曾到过英国？何时？逗留的时间？
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