secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?还有 light travels faster than sound 那个travel为什么要加s?

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secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?还有 light travels faster than sound 那个travel为什么要加s?

secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?还有 light travels faster than sound 那个travel为什么要加s?
secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?
还有 light travels faster than sound 那个travel为什么要加s?

secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?还有 light travels faster than sound 那个travel为什么要加s?
英语语法中,当句子的主语是单数名次或者代词的时候,句子的谓语动词要加 s,你给的两个句子中的主语--secondary school 和 light 都是单数名词,所以谓语动词 cover 和 travel 需要加s.如果不懂可以再问.

第二个问题是一般真理，在英语语法中一般真理使用一般现在时，而light是不可数的所以作为单数第三人称作主语要加s

因为travel和cover为动词，但是US和light为单数，因为动词在名词单数后要接S或者ES，所以travel和cover要变成travels和covers

因为你的主语表示的是单数，动词就要加s

靠，还要加个初中英语问题，老实说我也才大学毕业一年半，英语六级，我都忘干干了，还犹豫是不是第三人称。哎，现在水平不及初中了

因为主语（school、light）是单数，所以谓语动词要加s。

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