1 Mary works in a book store.Shelikesher work very much.
玛利在书店工作。 她非常喜欢她的工作
2.John and l are in the same school.Wego to school togeter.
3.Everybody likes that sport,dothey ? （ 不定代词，应该是第三人称）
4.She is a friend ofmine.We got to know each other two years ago.
5.Her sister makes allherselfown dresses.
6.l have many friend.Some ofthemare good at English.
7.May l useyourbike?Mine is broken.
我可以用你的自行车吗？我的坏了。
注意作主语时用主格，但名词性物主代词也可作主语，要注意根据上下文来决定。
！不明白再问！如果帮到你，请采纳，谢谢！