giúp mình với 
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4. Join the sentences using the time conjunction given and make the necessary changes
1. ...I have enough money. I buy you a new mobile.
(when) __________________________________________________________________
2. ...My students give me their homework. I correct it.
(once) _________________________________________________________________
3. ...Sarah finishes her studies. She gets married.
(when) __________________________________________________________________
4. ...He gets home from work. He takes off his shoes.
(when) __________________________________________________________________
5. ...I finished my project. I submitted it to the teacher.
(as soon as) ______________________________________________________________
6. ...The teacher explained the lesson. The students understood.
(as soon as) ______________________________________________________________