$\\$$\text{Ex 1.}$
$\\$`1.` instructions
$\\$`2.` turned
$\\$`3.` bigger
$\\$`4.` explosion
$\\$$\text{Ex 2.}$
$\\$`1.` Was
$\\$`2.` didn't go
$\\$`3.` didn't
$\\$`4.` stopped / got
$\\$`5.` listened

$\\$⇒ GT:
$\\$`1.` Công thức ( thì QKĐ )
$\\$→ Với ĐT thường
$\\$`(+)` S `+` V - ed / V2
$\\$`(-)`  S `+` didn't `+` V.
$\\$`(?)`  (Wh-) `+` did `+` S `+` V?

$\\$→ I / She / He / It `+` was / wasn't.
$\\$→ We / You / They `+` were / weren't.
$\\$`2.` Dấu hiệu nhận biết
$\\$⇒ Yesterday
$\\$⇒ Last year / month / week
$\\$⇒ In 1067, July
$\\$⇒ From January to December
$\\$⇒ In the 1999s
$\\$⇒ In the last century
$\\$⇒ In the past