Are you going to take that many of your toys with you?
Are you going to take all those toys with you?
Your をつける場合は 'many of your toys' が入って、こうなります。
'Are you going to take that many of your toys with you?'
強調が 'THAT many' に入って「そんなにいっぱい」というところです。
Your をつけない場合はたとえばこう言えます。
'Are you going to take all those toys with you?'
強調が 'ALL those' に入って「それ全部」というところです。
英語を学んでいる人はよく「my」
「your」をネイティブより使います。文法的に言えば大丈夫ですけどあまり言いません。
例えば:
How do you get to work?
I drive my car. --> I go by car. (Or) I drive.
How do you get to school?
I ride my bike. --> I go by bike. (Or) I ride a bike.
Is raising your kids hard? --> Is raising kids hard?
しかし、もし相手が子供だったら、いろいろな言い方が使います。「Your」も使えます。
You're taking so many of your toys with you.