Question

My sister ----(have)to look after my mother at home today

You --------(not have)to wear sweaters .It's too hot today

Answer 1

My sister has to look after my mother at home today
我的妹妹今天必须在家照顾妈妈。
因为my sister 是第三人称单数，故谓语动词要用单数，根据today 用一般过去式
You don't have to wear sweaters .It's too hot today
你不必穿毛衣，今天太热了！

don't have to do = it is unnecessary to do = needn't do 不必做...

望采纳，祝开心~！

追问

You --------(not have)to wear sweaters .It's too hot today

追答

填 don't have

Answer 2

①第一题填 has
解析：主语my sister为第三人称单数，且由today知道时态为一般现在时，所以have变为三单形式has.
My sister has to look after my mother at home today.
翻译为：我妹妹今天必须在家照顾我妈。
②第二题填 don't have
解析：由today知道时态为一般现在时，主语为第二人称，用have，have的否定形式是在其前面加don't
You don't have to wear sweaters .It's too hot today.
翻译为：你不必穿毛衣，今天太热了！

希望可以帮助到你，同时也祝你学习进步！

Answer 3

My sister (has)to look after my mother at home today.

主语第三人称单数，故要用has

You (don't have) to wear sweaters .It's too hot today.

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追问

You --------(not have)to wear sweaters .It's too hot today

追答

You (don't have) to wear sweaters .It's too hot today.
因为主语是YOU，而HAVE TO 的否定式是don't have to

Answer 4

has
主语my sister是第三人称单数，所以谓语动词要用第三人称单数形式。
句意：我妹妹今天必须在家照顾我妈。

祝你学习进步，更上一层楼！ (*^__^*)
不明白的再问哟！请记得采纳，多谢！

Answer 5

应该填has。
因为这里是第三人称单数形式，所以是has。
意思是：
我妹妹今天不得不在家照顾我妈。

第二个是don‘t have to

Answer 6

填 has，主语是单数，谓语动词用三单。希望采纳！！！！！！！！！