`1.` I work part-time to earn extra money because I want to have more books.

`+` HTĐ : `( + )` S + Vs-es + ...

`+` clause + because + clause : _____ vì _____

`2.` She was so tired that she couldn't stand up.

`+` S + be + so + adj + that + clause

`+` couldn't + V-inf

`3.` I think its's supposed to rain today, so you should bring your umbrella with you.

`+` clause, so + clause

`+` HTĐ : `( + )` S +  Vs-es + ...

`+` should + V-inf

`4.` I used to live in Bristol when I was a child.

`+` used to + V-inf

`+` QKĐ với tobe : `( + )` S + Vs-es + ...

`+` S_V when S + V

$#Ribee$