I.

1. some

2. some/any 

3. a

4. an

5. some

- Some + danh từ không đếm dc/danh từ số nhiều (thường dùng trong câu khẳng định)

- a/an + danh từ số ít

- any + danh từ không đếm dc/ danh từ số nhiều (thường dùng trong câu phủ định/nghi vấn)

II. 

1. If the tickets were cheap, we could fly to New York. 

2. If her mother had more money, she would buy that beautiful watch.

3. My brother would give up his job if he won a big prize in the lottery. 

4. Unless the weather improves, we can't go climbing.

5. If you don't give me the bicycle back, I will call the police. 

6. If he heard some news, he would write.