li tian---- ----- a sister(李天没有姐姐）

doesn't have (主语是第三人称单数，所以要用单三的形式）

Li tian doesn't have a sister

[- ( Li tian doesn't have a sister )

[- (>.< )

[- 绝对没错旳,

[- >>-其实我也不确定,嘿嘿!

doesn't have

don't have