Cấu trúc của Past Simple:
`\text{Đối với động từ tobe}`
(+) S + was/ were + N/Adj
(-) S + was/were not + N/Adj
(?) Was/Were+ S + N/Adj?
`=>` Yes, S + was/were.
`=>` No, S + wasn’t/weren’t
`\text{Đối với động từ thường}`
(+) S + V_ed
(-) S + did not + V_infinitive
(?) Did + S + V_infinitive?
`=>` Yes, S + did.
`=>` No, S + didn't
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`Answer`
`31)` Did/learn
`32)` waited
`33)` didn't have
`34)` did/do
`35)` didn't make
`36)` did/come
`37)` won
