After (leave) (1) leaving school when she was 18, Laura (go) (2) has gone to Bristol university for three years. While she (be) (3) was at university, Laura (join) (4) joined a university folk group and started singing. It was at this time that she (write) (5) wrote her famous song "The Price of Peace".
Giải thích:
(1) Sau giới từ+ing
(2) Hiện tại hoàn thành (for)+have/has+Vpp
(3) Quá khứ (while)+were/was
(4) Vế trước chia quá khứ thì vế sau cũng chia quá khứ.
(5) Quá khứ (at this time)+Ved/cột 2
( vế trước cũng được chia là quá khứ nên vế saucungx chia quá khứ)
CHÚC BẠN HỌC TỐT./.