$2$. I am afraid of dogs

$-$ I am not afraid of dogs

$3$. Canada is a big country

$-$ Canada isn't a big country

$4$. My teacher is young

$-$ My teacher isn't young

$5$, It is hot today

$-$ It isn't hot today

$6$. I am hungry

$-$ I am not hungry

`->`I + am ( not )

`->`He/She/It/DT số ít/DT ko đếm dc + is ( not )

`->`You/We/They/DT số nhiều + are ( not )

$2.$ I am afraid of dogs $/$ I am not afraid of dogs.

$3.$ Canada is a big country $/$ Canada is not a big country.

$4.$ My teacher is young $/$ My teacher is not young.

$5.$ It is hot today $/$ It is not hot today.

$6.$ I am hungry $/$ I am not hungry.

$=========="$

*Cấu trúc: Thì hiện tại đơn với động từ tobe

$(+)$ S + am (I) $/$ is (He, She, It, Danh từ số ít) $/$ are (You, We, They, Danh từ số nhiều) + $...$

$(-)$ S + am (I) $/$ is (He, She, It, Danh từ số ít) $/$ are (You, We, They, Danh từ số nhiều) + not + $...$

$(?)$ Am (I) $/$ Is (He, She, It, Danh từ số ít) $/$ Are (You, We, They, Danh từ số nhiều) + S + $...$ + $?$