`1.` If it doesn't rain, they will go for a picnic tommorrow.

`-` Unless : trừ khi = If ... not : nếu không.

`2.` Unless Hoa invite us, we will come to the party.

`-` Unless : trừ khi = If ... not : nếu không

`3.` Although I had a big lunch, I still felt hungry.

`-` Although + Clause 1 , Clause 2 : mặc dù ,

`4.` My father has worked as a teacher since `2011`.

`-` Cấu trúc: S + started/began + V_ing/to V + time

   = S + have/has + V2/Ved + since/for + time

`5.` Basketball is Mark's favourite sport. 

`-` like(s) + V_ing : thích làm gì

1 If it doesn't rain, they will go for a picnic tomorrow.

( Unless=if not)

2 Unless Hoa invite us, we will come to the party.

(Unless=if not)

3 Although i had a big lunch, i still felt hungry.

( Although+S+V: mặc dù)

4 My father has worked as a teacher since 2011.

( Thì hiện tại hoàn thành)

5 Basketball is Mark's favourite sport.