1. (-) It wasn't rainy yesterday
(?) Was it rain yesterday?
2. (-) Tom hasn't spoken VNese well before
(?) Has Tom spoken VNese well before?
3. (-) They didn't went to school by bus last year
(?) Dis they went to school by bus last year?
4. (-) He didn't study Math last month
(?) Did he study Math last month?
Rewrite
1. We have worked in HN for 20 years
(-) We haven't worked in HN for 20 years
(?) Have you worked in HN for 20 years?
2. She has eaten this food for a long time
(-) She hasn't eaten this food for a long time
(?) Has she eaten this food for a long time?
3. Tom played football in 2000 / Tom has played football since 2000
(-) Tom didn't play football in 2000 / Tom hasn't played football since 2000
(?) Did Tom play football in 2000? / Has Tom played football since 2000?