`81.`
Thuy’s brother lives in Ho Chi Minh City and he has a big toy store there. 
`->` `HTD` `:` `S` `+` `V` `-` `s` `/` `es`

`82.` Many plants and animals in Viet Nam and around the world are in danger because people are destroying them.
`->` Be in danger `:` đang gặp nguy hiểm

`83.` My father often plays chess with his friends, but sometimes he plays with me.
`->` often `,` sometimes `->` `HTD` `:` `S` `+` `V` `-` `s` `/` `es`

`84.` Are the Bakers and their friends traveling to Da Lat by plane at the moment `?`
`->` `At` `the` `moment` `->` HTTD `:` `S` `+` `be` `+` $V$_$ing$

`85.` My mother doesn’t need rice. She needs half a kilo of pork and a dozen eggs.
`->` `a` `dozen` `eggs` `:` `1` tá trứng `->` HTĐ `:` `S` `+` `V``-``s``/``es`
$#Xavia$

`86` Thuy's brother lives in Ho Chi Minh city and he has a big toy store there

`-` S + V(s/es) + O 

`-` S + has/have + N + ... 

`87` Many plants and animals in Viet Nam and around the world are in danger  because people are destroying them 

`-` S + be + adj/N 

`-` S + is/am/are + V-ing + O 

`-` Because : bởi vì `->` lí do , nguyên nhân 

`88` My father often plays chess with his friends but sometimes he plays with me

`-` Thì Hiện Tại Đơn - often,sometimes

`-` S + V(s/es) + O 

`->` He là chủ ngữ số ít `->` chia V(s/es) 

`89` Are the Bakers and their friends travelling to Da Lat by plane at the moment ? 

`-` Thì HTTD - at the momment

`-` Is/am/are + S + V-ing + O ? 

`-` Chủ ngữ có 2 ngôi `->` chia are 

`90` My mother doesn't need rice . She needs half a kilo of pork and a dozen eggs 

`-` S + don't/doesn't + V-inf + O 

`-` S + V(s/es) + O