1. Its lack of irregular verbs makes Esperanto a unique language.
Unlike other languages, Esperanto doesn't have irregular verbs
-> Unlike + N: không giống như ...
2. Mr. Smith knew little about the Internet, so he didn’t invest into any computer companies.
Had Mr. Smith known much about the Internet, he would have invested into some computer companies
-> Đảo ngữ câu đk: Had + S + Vpp , S + would have + Vpp
3. The Board of Directors discussed the business in length, but came to no decision.
The Board of Directors had a long discussion on the business, but came to no decision
-> Have discussion on sth: Thảo luận về cái gì
4. When she got to the party, everyone was dancing and singing.
On her arrival at the party, everyone was dancing and singing
On + V-ing/sth = When + S + V - Ngay sau khi ...
5. Barbara runs a successful company and she also manages to look after her five children.
Not only does Barbara run a successful company, but also she manages to look after her five children as well
Not only + TĐT + S + V, but also ...
6. If I met the author one day, I'd ask him to sign my copy of this book.
Were I to meet the author one day, I would ask him to sign my copy of this book
Đảo ngữ câu đk loại 2: Were + S + to-V, S + would/could + V
7. He always has his nose in a book and never pays attention to what I say.
If he didn't have his nose in a book, he might pay attention to what I say
-> Câu đk loại 3
8. You are under no obligation to accept their offer.
You can please yourself about whether you accept their offer or not
-> Please yourself about - tự bản thân quyết định nên làm gì hay về điều gì ..