请你根据以下例句，总结出leave、hear、return、ask和hope的用法。

leave:

1)She's leaving for Shanghai on Tuesday.

2)We are leaving Shanghai on Thursday.

3)I can't leave my baby by herself.

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hear:

1)I hear that Thailand is a good place to go sightseeing.

2)She often hears the boy sing in the next room.

3)I can hear her crying.

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return:

1)You'll be relaxed when you return from your vacation.

2)You should return my English book.

3)He needs to return the books to the library.

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ask:

1)I want to ask you about your family.

2)She often asks me to help her with her English.

3)Ask the police for help when you are in trouble.

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hope:

1)I'm hoping the weather will be nice in the mountains.

2)They hope to go swimming this afternoon.

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