Chris大王
（1）没有。（2）day有复数形式。Thereare7daysinaweek.一周有七天。（3）time指次数时有复数形式。threetimesaweek.一周三次。（4）time指时间时没有复数形式。daytime指白天的时间，没有复数形式。但愿能帮到您。祝您进步。
edward1015
在白天
[词典] by day; by daylight; in the day; in the daytime; during the day
[例句]
1、He works in an office by day and drives a taxi by night.
他在白天上班，在晚上开出租车。
2、It's no use trying to escape by daylight.
在白天想逃跑是办不到的。
3、At night Lucy started to GO through the bundle of letters that she received in the day.
晚上，露茜开始看她白天收到的一扎信件。
4、In the daytime they have sent to their friends each a postcard.
在白天，他们已经给每位朋友寄了一张明信片。
5、They only work during the day, all right?
他们只在白天工作，明白了吗？
调皮捣蛋妈
在白天：in the daytime、in the day
短语解析：
1、in the daytime
英文发音：[ɪn ðə ˈdeɪtaɪm]
中文释义：在白天，在白昼
例句：
We left in the daytime so as not to arouse suspicion.
我们在白天离开以避免引起怀疑。
2、in the day
英文发音：[ɪn ðə deɪ]
中文释义：在白天
例句：
There is only so much time in the day for answering letters
白天回复信件的时间只有这么多。
扩展资料
词汇解析：
1、daytime
英文发音：[ˈdeɪtaɪm]
中文释义：n.白天;白昼;日间
例句：
Even at the end of the war, German factories mainly operated only in daytime.
即使在战争末期，德国工厂也基本上只在白天开工。
2、day
英文发音：[deɪ]
中文释义：n.一天;一日;白昼;白天;工作日;一天的活动时间
例句：
I had other matters to occupy me, during the day at least
至少白天我还有别的事情要做。
