$\text{6.}$ If you aren't careful , you will fall down. 

→ V + or/otherwise + S + will/can/may + V-inf + O 

→ If + S + be/V + not + V-inf , S + ill/can/may + V-inf  O 

$\text{7.}$ My brother hasn't eaten cakes since 2014. 

→ S + last + Ved/cột 2 + O 

→ S + hasn't/haven't + Vpp + for/since + ...

$\text{8.}$ How long have they begun buying food ? 

→ When + did + S + V-inf + O ? 

→ How long + has/have + S + Vpp + O ? 

$\text{9.}$ It takes Nga 4 hours a day to practice English with her friends. 

→ spend time doing sth = it take sb time to do sth : dành thời gian làm j 

$\text{10.}$ It's very important to keep the environment . 

→ It's  + adj + to + V-inf + ... = V-ing + ... + be + adj 

$#Keisha$

$6$ `:` If you aren't careful , you will fall down.

Câu điều kiện loại  `1:`

`->` S `+` V ( s / es ) `+` O , S `+` will `+` V_inf `+` O.

Cách dùng:

`->` Dùng để diễn tả những sự việc có khả năng xảy ra ở hiện tại hoặc tương lai và kết quả của nó.

$7$ `:` My brother hasn't eaten cakes since  `2014`.

Cấu trúc:

S `+` ( last ) `+` V2 / V`-`ed `+` O `+` ( in `+` time / time `+` ago ).

`->` S `+` hasn't / haven't `+` VpII `+` O `+` ( for `+` khoảng thời gian / since `+` mốc thời gian ).

$8$ `:` How long have they bought food ?

Cấu trúc:

When `+` did `+` S `+` start / begin `+` V`-`ing `+` O ?

`->` How long `+` have / has `+` S `+` VpII `+` O ?

$9$ `:` It takes Nga  `4`  hours a day to practice English with her friends.

Cấu trúc:

S `+` spend ( s ) `+` time `+` V`-`ing `+` O.

`->` S `+` takes `+` S `+` time `+` to `+` V_inf `+` O.

$10$ `:` It's important to keep the environment clean.

Cấu trúc:

V`-`ing `+` O `+` is / am / are `+` adj.

`->` It's `+` adj `+` to `+` V_inf `+` O.