1. If Mr. Binh didn’t work with some Australians; he wouldn’t use English every day.

2. The letter that I received this morning had good news.

3. You could enroll in this course if you had an English certificate.

4. The woman with whom my mother is talking is/comes from England/is English.

5. If I were you, I would read English newspapers to improve the reading skill.

   Chúc bạn học tốt :)

1.Mr. Binh uses English every day because he works with some Australians.

→If Mr. Binh didn’t work with some Australians,he wouldn’t use English every day.

2.I received a letter this morning and it had good news.

→The letter that I received this morning had good news.

3.You don’t have an English certificate, so you cannot enroll in this course.

→You could enroll in this course if you had an English certificate.

4.My mother is talking with an Englishwoman.

→The woman with whom my mother is talking is/comes from England/is English.

5.I think you should read English papers to improve your reading skill.

→If I were you, I would read English newspapers to improve the reading skill.

Chúc bạn học tốt ^_^!!!
(Nếu thấy hay hãy vote 5*,cảm ơn và bình chọn là câu trả lời hay nhất để mik có động lực giải tiếp các BT khác nhé!)