`1`/ It was very noisy so she couldn't sleep
`2`/ They wanted to study hard abroad so i learn English.
`3`/ I couldnt do this exercise so i ask tom for help.
`4`/ My bicycle was stolen so my mother bought another one for me.
`5`/ I want to study hard aboard so i learn english
`6`/ She's very hard-working. All right for us like her
`7`/ The rain was very heavy so we took a taxi home.
A clause ( action ) + so + a clause ( purpose )