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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请你观察下面的词组。注意词组中“a”和“an”的用法有何区别。

a book　　a bag　　a pencil

a photo　　an eraser　　an apple

a和an的用法区别：________________________

请你根据以下例句，总结出play、come、have to、study和visit的用法结构。

　　play:

　　1)The children are playing with a ball.

　　2)Do you want to play football this weekend?

　　3)He is playing the piano.

　　4)They are watching a TV play.

　　________________________________

　　come:

　　1)How do you come to school?

　　2)Do you want to come to my birthday party?

　　3)Marie's birthday is coming soon.

　　4)Monday comes after Sunday.

　　________________________________

　　have to:

　　1)Does Dave have to do his homework now?

　　2)I can't join you because I have to help my mom.

　　3)Mary has to stay at home because her mother is ill.

　　4)He doesn't have to go there.

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　　study:

　　1)Does Rosie study English?

　　2)Please keep quiet t I'm trying to study.

　　3)She is studying the map.

　　4)Tom studies very hard.

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　　visit:

　　1)The students are visiting Uncle's factory.

　　2)My American friends are going to visit me next vacation.

　　3)They are on a visit to Shanghai.

　　4)Thank you for your invitation to visit next week.

　　________________________________