$\text{Công thức:}$

`(+)`$\text{S + be(am/is/are)....}$

`(-)`$\text{S + be +not...}$

`(?)`$\text{Be + S....?}$

$\begin{cases} am + I\\is + he/she/it...N\\are + we/you/they...Ns \end{cases}$

`6`. $\text{am}$

`7`. $\text{are}$

`8`. $\text{am}$

`9`.$\text{are}$

`10`.$\text{is}$

`11`.$\text{are/am}$

`12`.$\text{is/is}$

`13`.$\text{are/are}$

`14`.$\text{are/aren't}$

`15`.$\text{is/is}$

$\text{ Đáp án: }$

$\text{6.}$ am

$\text{7.}$ Are 

$\text{8.}$ am

$\text{9.}$ Are

$\text{10.}$ isn't

$\text{11.}$ Are, am

$\text{12.}$ Is, isn't

$\text{13.}$ are, are

$\text{14.}$ Are, aren't

$\text{15.}$ Is, is

- - - - - - - - - - - - -

$\text{Công thức thì hiện tại đơn (với động từ "tobe")}$

$\text{ (+) S + am/ is/ are + N/ Adj }$

$\text{ (-) S + am/ is/ are + not + N/ Adj }$

$\text{ (?) Am/ Is/ Are + S + N/ Adj? }$

$\text{ CHÚC BẠN HỌC TỐT! }$