I haven’t gone to school for 4 months because of COVID-19.
`→` It is 4 months since I last went to school because of COVID-19.
`→` I last went to schoold 4 months ago because of COVID-19.
`→` The last time I went to school was 4 months ago.
* Giải thích các bước làm :
S + last + V quá khứ + thời gian ( 2 days ago/in 2010)
= The last time + S + V quá khứ + was thời gian
= S + have/has not + VPII + for/since thời gian
= It is + Thời gian + since + S + last + V quá khứ