Jawaban:

1.rina bougt new mobile phone last ningt

(-) rina didnt buy new mobile phone last ningt

(?) did rina buy new mobile phone last night?

2.I was a student

(-) I was not a student

(?) Was I a student?

3.I was slim

(-) I was not slim?

(?) Was I slim?

4.It was 7 o'clock when i come to your cllasroom

(-) It was not 7 o'clock when i come to your cllasroom

(?) was it 7 o'clock when i come to your cllasroom?

5.we were classmate

(-) we were not classmate

(?) were we classmate?

Penjelasan:

menggunakan simple past tense karena pada nomor 1 terdapat verb 2 bought, dan kalimat yg lainnya terdapat be lampau seperti was/were, dan ada keterangan waktu last, yg berarti kejadian sudah terlampaui.

Hanya nomor 1 yg menggunakan simple past verbal, dengan rumus:

(+) Subjek + Verb 2 + Object

(-) Subject + didnt + Verb 1 + Object

(?) did + Subject + Verb 1 + Object?

Nomor lainnya menggunakan rumus simple past nominal (Adjective, noun, Adverb)

(+) Subjek + be (Was/Were) + Nominal

(-) Subjek + be (Was/Were) + not + Nominal

(?) be (Was/Were) + Subjek + Nominal?