1. She wasn't here so she couldn't help you.

→ so = vì vậy

2. Hoa used to eat a lot of sweets when she was a child but she never eats sweets now.

→ used to + V = đã từng làm gì

3. My father has worked in this company for three years.

→ Thì hiện tại hoàn thành: has/have + V3/ed

$\text{37.}$ She was not here , so she couldn't help you . 

→ clause 1 + because + clause 2 ( nêu lí do của 1 sự việc ) 

→ clause 1 , so + clause 2 ( nêu kết quả của 1 sự việc ) 

$\text{38.}$ Hoa used to eat a lot of sweets when she was a child ( but she never eats sweets now ) .

→ used to + V-inf : đã từng làm j 

$\text{39.}$ My father has worked in this company for three years . 

→ S + started/began + to V/V-ing + when/in/on/ago/... 

→ S + has/have + Vpp + for/since + time ( trong QK ) 

$#Keisha$