If the mood takes me, I'll head down the beach for an evening stroll.
如果心情不好,傍晚我会到海边散步。
If not, our repairman can come to you.
要不然,我们的维修人员可以上你那里去。
She always referred to them as 'the shifting population', for they came and went with such frequency that I never even got a chance to learn their names.