THÌ QUÁ KHỨ:

( động từ thường )

(+) S + V-ed + O

(-) S + didn't + V + O

( động từ to be )

(+) S + was/were + O
(+) S + was/were + not + O

THÌ QUÁ KHỨ TIẾP DIỄN:

(+) S + was/were + V-ing.
(-) S + was/were + not + V-ing

1. wasn't/ was studying
2. was sleeping
3. was shining/ were singing
4. were talking/ walked
5. weren't/ were playing
6. fell/ was reading
7. was snowing/ was shining
8. was shoveling/ brought

CHO MÌNH CÂU TRẢ LỜI HAY NHẤT NHAA :3

1. Wasn’t - was studying
2. Was sleeping
3. Were singing
4. Was talking - was walking
5. Weren’t - were playing
6. Was reading
7. Was snowing - was shining
8. Brought 
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Thì QKTD diễn tả hành động đang xảy ra tại một thời điểm trong quá khứ

Công thức : S was/were(not) Ving

Was/were S Ving?

Wh- was/were S Ving?

DHNB: at that time, when, while...

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Thì QKĐ diễn tả hành động xảy ra và kết thúc trong quá khứ

Công thức : S V-ed/C2

S didn't Vnt

Did S Vnt?

Wh- did S Vnt?

DHNB: ago, last, yesterday,...