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He/She
climbs the mountain.
动词原形 动词单三
play ---------------- plays
see ---------------- sees
climb ---------------- climbs
1.直接加-s
2.特殊形式
do ---------------- does
fly ---------------- flies
当主语为第一（l）、第二（you）及第三人称复数(they)时，动词或助动词要用原型。当主语为第三人称单数时(he, she, it及人名物名的单数形式时), 动词要变形,变成第三人称单数形式（即动词的单三形式）.
often fly a kite.
often flies a kite.
I
She
What ____ he do on sunday ? He often ______ the mountains.
climbs
does
Good morning, Grandpa! What are you doing?
I’m doing exercise. What do you do on Saturday?
I do some exercise, too. I often play football.
经常
What does your father do on the weekend?
He often climbs the mountains.
What about your mother?
She often does some washing.