$\text{YeunhatbanT}$
$\text{3.A birthday cake is not being made now}$
$\text{S + is/am/are + V_ing + o}$
$\text{⇒ S + is/am/are + be + VpII + by O}$
$\text{4.Viết sai đề rồi : won ⇒ win (vì sau will là V nguyên)}$
$\text{The scholarship will be won next month}$
$\text{S +_ will + V}$
$\text{⇒ S + will + be + VpII}$