3. When + did + S + V...... ? = How long + have/ has +S + VP3 ...
4. S + Have never + VP3 .... before = the first/second/third /.. S + have + VP3....
Ví dụ : 3. When did she live in that house ?
=) How long has she lived in that house ?
4. I have never seen her before .
=) This is the first time i have seen her
CHÚC BẠN HỌC TỐT!! BREAK A LEG