把下面句子变为英语

我是英语老师，帮帮你。
我妈妈的生日：My mother's birthday
罗伯特的年龄：Robert's age
她父母亲的卧室：Her parents' bedroom
三年的时间：Three years' time
蒂娜的爷爷的爷爷：Tina's grandfather's grandfather
祝你进步！

我妈妈的生日：My mother's birthday
罗伯特的年龄：Robert age
她父母亲的卧室：Her parents bedroom
三年的时间：Three years of time
蒂娜的爷爷的爷爷：Tina's grandfather's grandfather
(仅供参考)

我妈妈的生日 my mother'birthday
罗伯特的年龄 Robert' age
她父母亲的卧室 her parents' bedroom
三年的时间 three years of time
蒂娜的爷爷的爷爷 Tina's grandfather's grandfather

my mother's birthday
Robert's age
her parents' bedroom
In three years time
Tina's grandfather's grandfather