Mary is 12 years old.Two years ago,she was twice as old as her brother Jack.How old is Jack now?我读不太懂这是什么意思,希望英语能手能帮帮我回答这个问题

同意句:Lucy is 12 years old ,Mary is 20 years old. Mary is 10 years old,I am 12 years old.合为同一句要尽快Mary is ----- ------- ------- than me Mary is six years old(对six years old提问 Mary is 8 years old.同义句 Alice is four years old.Mary is eight years old.(同义句转换) Mary is_______Alice's________. Mary is 12 years old.two years ago,she was twice as old as her brother jac MARY IS 12 YEARS OLD .TWO YEARS AGO ,SHE WAS TWICE AS OLD AS HER BROTHER JACK.HOW OLD IS JACK IS? 急mary is 12 years old .two years ago ,she was twice as old as her brother jack.how old is jack now? Mary is 12 years old.Two years ago,she was twice as old as her brother Jeck.How old is Jeck now? Mary is 12 years old.Two years ago, shewas twice as old as her brothei jack,How old is jack now? Tom is fifteen years old.Mary is fifteen years old,too(改为同意句） Mary is 15years old .Peter is also 15 years old.合并一句 Mary is ____ _____ _____Peter. Mary is 8 years old.Kate is also 8 years old.(合并成一句）Mary is ____ ____ _____ Kate. Mary is 16 years old.（改为同义句） Mary is ten years old.(同义句转换) Mary is () () girl. Mary is ten years old.同义句转换Mary is ( ) ( ) girl. mary is fourteen years old now.可改为___ ____ is Mary now 英语开放探究题1.Mary is 12 years old.two years ago,she was twice as old as her brother Jack.How old is Jack now?How old will Mary be when Jack is twice his present age?2.Peter is 15 years old.Three years ago,his younger sister Michaelle was ha