jack always( )(study)hard at school

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jack always( )(study)hard at school
jack always( )(study)hard at school

jack always( )(study)hard at school
Jack always(studies)hard at school.
一旦出现always,就一定是一般现在时,所以Jack是第三人称动词要变成第三人称单数形式,也就是study把y变成i再加es(一般结尾为y的动词要变y成i在家es,但少数如play要直接加s).

is always studying

studies

Jack always (studies) hard at school.用一般现在时,主语是第三人称单数,故用studies