I. "sign up"là phrasal verb nội động từ
II. Cách dùng phrasal verb: sign up
Mang nghĩa"đăng kí"
=If you sign up for an organization or if an organization signs you up, you sign a contract officially agreeing to do a job or course of study/to agree to become involved in an organized activity:
IELTS TUTOR xét ví dụ:
- He signed up as a steward with P&O Lines.
- He saw the song's potential, and persuaded the company to sign her up.
- I've signed up to make the sandwiches for the party.
- She's signed up for evening classes at the community college.