Giải giúp và viết lại câu thành Unless(ko cần giải thích)

`19`. isn't 

`->` Chuyển thành unless : 

`15`. Unless she walks every day, she won't be healthy enough.

`16`. Unless Max accepts Alex's invitation this time, Alex won't invite him again.

`17`. Unless my kid reads this book, he won't get a good mark in literature.

`18`. Unless Tom waters the violets, they will die.

`19`. Unless Lena is happy, she won't stay there for a long time.     

`20`. Unless my son makes his bed, he won't play football with his friends.

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`@` Unless `+` S `+` V( s,es ) `+` O , S `+` will `/` modal verbs `+` V-inf `+` O .

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