`37` Fiona was invited to John' s birthday party last night

`-` Có "last night" `->` QKĐ

`-` BĐ `-` QKĐ : (+) S + was/were + `V_(pp)` + .... + (by O/sb)

`-` Chủ ngữ "Fiona" số ít `->` Dùng was

`38` He said that his mother was preparing the dinner in the kitchen then

`-` Câu tường thuật (Statement) : 

`-` S + say + S + V (lùi thì) + ....

`-` Lùi : HTTD `->` QKTD

`-` QKTD : (+) S + was/were + V-ing + ....

`-` Đổi : now `->` then

`-` Đổi TTSH : My `->` His

`39` Unless she is busy this afternoon , she won't go shopping with her mother

`-` Unless `=` If not : trừ khi 

`-` Câu ĐK loại `1` : 

`-` If clause : S + `V_0` `/` `V_S` `/` `V_(es)` + ...

`-` Main clause : S + will/can/shall.... + `V_0` + ....

`40` They began learning English `5` years ago 

`-` S + Have/has + `V_(pp)` + ... since / for + time / time line

`-` `=` S + began + V-ing+ ... time + (ago)

`->` Ai đó làm gì từ khi + thời gian / trong khoảng + thời gian

`-` `=` Ai đó bắt đầu làm gì đó + thời gian (trước)

`\text{@ TheFallen}`