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Good morning, Grandpa! What are you doing?
I am doing exercise. What do you do on Saturday?
I do some exercise, too. I often play football.
Let’s talk
What does your father do on the weekend?
He often climbs the mountains.
What about your mother?
She often does some washing.
一般现在时的肯定句中，主语为第三人称单数的动词变化主要体现在词尾的变化上，其规律为：
（1）一般情况下，直接在动词词尾+s?。如：
play—plays write—writes climb—climbs
拓展：英语动词第三人称单数变化规则
（2）以s,?x,?sh,?ch,?o结尾的动词，在词尾+?es?。如：
guess — guesses fix—fixes
finish — finishes? teach—?teaches
go — goes do?—does?
（3）以辅音字母+?y?结尾的动词，先把y变为i，再加es。
如：study—studies? try—tries? fly?—flies?
（4）不规则动词（特殊情况）。
如：?have?—has? be?—is?
Read and match
Hi, I’m Wu Chen! I often dance on Sundays. My mother does some cooking. And my father does some washing. What do my grandpa and grandma do? They often watch TV and do exercise. How happy we are!