`1.` Hana hasn't written to her pen pal for five months.

`-` S + (last) + V-ed/c2 + ... + time ago

`=` S + haven't/hasn't + V-ed/c3 + ... + for time

`2.` This box is not light enough for me to carry.

`-` S + tobe + too + adj + (for sb) + to V-inf

`-` S + tobe + (not) + adj + enough + (for sb) + to V-inf

`3.` It takes me 20 minutes every day to walk to school.

`-` It + takes + sb + time + to V-inf

`4.` Jack knows Anna doesn't like him , but he still chases after.

`-` chase after sb : đuổi theo ai

`-` S + V although S + V

`=` S + V , but S + V

`5.` This bag was given to me by my brother.

`-` Bị động QKD : S + was/were + V-ed/c3 + ... + (by+O)

`-` give sth to sb : đưa thứ gì cho ai