Можно использовать любой вариант:
1) She can't dance but she can sing.
2) She can't sing but she can dance.
3) She can sing but she can't dance.
4) She can dance but she can't sing.
They may join the police force or other law enforcement agencies. Они могут пойти на службу в полицию, либо другие правоохранительные учреждения.
LLB degree holders may enter the workforce immediately or may study towards the Master degree (LLM). Лица, закончившие бакалавриат по специальности юрист (LLB), уже могут поступить на службу, либо продолжить образование для получения степени <span>магистра (LLM).</span>
<span>Is my father a worker? Yes. he is. No he isn't. 2 Is he an engineer now? Yes he is. No he isn't. 3 Are these children little? Yes they are. No they aren't. 4 Are you my best friend? Yes I am. No I am not. 5 Is your daughter a pupil? Yes she is. No she isn't. 6 Am I a student? Yes I am. No I am not. 7 Are they good boys? Yes they are. No they aren't. 8 Is our mother a teacher? Yes she is. No she isn't.</span>
4. mustn`t
5. Can, can
6. must
7. mustn`t
8. should
9. Can, can`t, can
10. won`t, will
Из страдательного в действительный:
1) The painting has been valued by an expert. - An expert has valued the painting.
2) He likes being given presents. - He likes when people give him presents.
3) The bill must be paid immediately. - You must pay the bill immediately.
4) Hot water is provided by the hotel 24 hours a day. - The hotel provides hot water 24 24 hours a day.