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The Past Continuous and Simple past tenses

Past continuous --> sedang terjadi di masa lampau, ada waktu spesifik.
S + was/were + present participle.

Simple Past --> terjadi dan selesai di masa lampau yang tidak spesifik.
S + preterite

1.
(+) He was walking while my grandmother was running.
(-) He wasn't walking while my grandmother was running.
(?) Was he walking while my grandmother was running?

2.
(+) You were doing the washing while they were eating.
(-) You weren't doing the washing while they were eating.
(?) Were you doing the washing while they were eating?

3.
(+) My cat was drinking milk while my dog was eating.
(-) My cat wasn't drinking milk while my dog was eating.
(+) Was my cat drinking milk while my dog was eating?

4.
(+) Nana and Nini were crying when you left.
(-) Nana and Nini weren't crying when you left.
(?) Were Nana and Nini crying when you left?

Past Continuous Tense
->kejadian yang "sedang" terjadi di suatu waktu di masa lalu
S+was/were+V-ing

contoh
kami sedang makan ketika anda datang kemarin
We were eating when you came yesterday.

Present Continuous Tense
->Kejadian yang sedang berlangsung saat kalimat tersebut dikatakan
S+am/is/are+V-ing

contoh
*saya sedang mengerjakan pr dan ibu/ayah saya bertanya*
ayah/ibu = What are you doing ,son ?
Saya = I'm doing my homework right now.