$\text{1. barking }$
$\text{2. were}$
$\text{3. laughing}$
$\text{4. was not snowing }$
$\text{5. were watching }$
$\text{6. not}$
$\text{7. were not listening }$
$\text{8. was not doing }$
$\text{9. were }$
$\text{10. was not chasing }$
$\text{Cấu trúc thì Qúa khứ tiếp diễn}$
$\text{S + was/were + V-ing (+ O)}$