*Cấu trúc toàn bài:

$-$ When + did + S + V (Bare)?

  $+$ "Đã làm gì khi nào ...?"

$-$ How long + have/ has + S + V (Pii)?

  $+$ "Đã làm gì kể từ lúc nào, khoảng thời gian bao lâu ... ?"

$-----------$

$c.$ $...$

$2.$ When did Martha move out?

- "When she got engaged": mốc thời gian trong quá khứ.

$→$ When + did + S + V (Bare)?

$3.$ How long have she and her husband been married?

- "for + khoảng thời gian"

$→$ How long + have/ has + S + V (Pii)?

$4.$ How long has she been pregnant?

- since + mốc thời gian.

$→$ How long + have/ has + S + V (Pii)?

$5.$ When did she become a professional photographer?

- "six years ago": mốc thời gian trong quá khứ.

$→$ When + did + S + V (Bare)?

$6.$ How long has she been freelance?

- since + mốc thời gian.

$→$ How long + have/ has + S + V (Pii)?

$7.$ When did she get her Nikon 601?

- "She got it ...": mốc thời gian trong quá khứ.

$→$ When + did + S + V (Bare)?

$d.$ $...$

$-$ Bài này chỉ cần dựa vào cấu trúc ghi trên cùng:

$2.$ is she $→$ has she been.

$3.$ were $→$ have been.

$4.$ for $→$ since.

$5.$ do you have $→$ have you had.

$6.$ since $→$ for.

$7.$ has $→$ has had.

$8.$ live $→$ have lived.