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`-` Thì HTHT : 

`+` KĐ : S + have / has + V3 / PII

`+` PĐ : S + haven't / hasn't + V3 / PII

`+` NV : Have / Has + S + V3 / PII ?

`=>` `DHNB` : since , for , already , ....

`1`.Tom hasn't come back to his hometown for 5 years

`2`.He has worked as a teacher for 6 months

`3`.We have gone to Japan for 3 years

`4`.I haven't had my hair cut since June

`5`.We haven't met for 2 years

`6`.We haven't called each other for a long time

`7`.How long have you had 10 scores in Math ?

`\text{# Kirigiri}`