居然忘记了，整理一个说明加深印象。

一般现在时态，当主语为第三人称单数时，谓语动词的三单形式：

1、一般动词尾加 s

My father works in the hospital as a docter.

He likes reading at night.

The little cat drinks milk every day.

2、以 -o,-s,-x,-sh,-ch 结尾的动词加 -es

He always goes to school by bike.

He doesn’t feel well today.

Does he have lunch at school? 

He watches TV every night.

She teaches us Chinese.

The cat catches a mouse.

3、以辅音字母加 y 结尾的，变y为i，再加-es。（如果是元音字母加 y，则直接加 -s ）

He studies very hard.

The kite flies in the sky.

He cries because his lose his money.