Simple past tense:

(+) S + Verb2

(-) S + (didn't) +Verb1

(?) Did + S + Verb1

Richard was painting the wall.

Richard painted the wall.

They had not learned together.

They didn't learn together.

Will you open the door please?

Did you open the door please?

Present Continuous tense.

(+) S + am/is/are + Verb-ing

(-) S + am/is/are + not + Verb-ing

(?) am/is/are + S + Verb-ing

Baskoro is a diligent student.

Baskoro is being a diligent student.

Rudi does not write a letter.

Rudi is not writing a letter.

Marjono and Bedu will not stop the bus.

Marjono and Bedu are not stopping the bus.