`41`.He hasn't eaten seafood for 3 months

`\rightarrow` Thì HTHT ( CPĐ ) : S + haven't / hasn't + V3 / PII ( `41 , 43 , 45` )

`\rightarrow` Đặc điểm nhận dạng : for

`42`.They last played tennis 3 weeks ago

`\rightarrow` S + last + Ved / V2 + time / timeline : Lần cuối làm gì ( `42 , 44` )

`43`.She hasn't met him since Sunday

`\rightarrow` Đặc điểm nhận dạng : since ( `43 , 45` )

`44`.We last spoke to him in 2012

`45`.I haven't gone to Da Lat since 2010

`46`.Nobody in the class is taller than Hoa

`\rightarrow` So sánh hơn : S1 + is / am / are + adj-er / more adj + than + S2

`47`.Mr.Smith is the richest person in this city

`\rightarrow` So sánh nhất : S + is / am / are + the adj-est / the most adj ( `47 , 49` )

`48`.No other student in this class is more intelligent than Peter

`49`.The Mekong River is the longest in Viet Nam

`50`.Da Nang City is not as large as Ho Chi Minh City

`\rightarrow` So sánh ngang bằng : S1 + is / am / are ( not ) + as + adj + as + S2

`\text{# Kirigiri}`