Every week为什么不用weeks every third week, every three ...

every second week every two weeks \u6709\u4ec0\u4e48\u533a\u522b

\u4e0d\u76f8\u7b49.every scond week\u662f\u6bcf\u9694\u4e00\u5468,\u5fc5\u987b\u53d1\u751f\u5728\u7b2c\u4e8c\u5468.
every two weeks\u662f\u4e24\u5468\u4e2d\u4efb\u4f55\u65f6\u5019\u90fd\u80fd\u53d1\u751f.

every third week, \u6bcf\u4e2a\u7b2c\u4e09\u5468
every three weeks \u6bcf\u4e09\u5468

everyweek是形容词，后面不能加s，every后面的名词只能用单数，因此everyweek也不能加s

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