$\text{Đáp án :}$

`2.` Linda's birthday is on the fifteen of December.

`3.` My little brothers played chess with their friends last weekend. 

`4.` Reading comic books is lots of fun.

$\text{Cấu Trúc :}$

$\Rightarrow$ $\text{S + be + on the + ...}$

$\Rightarrow$ $\text{S + V-ed + ...}$

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

$\text{@1412}$

`2.` Linda's birthday is on the fifteenth of December. 

`@` Tính từ sở hữu `+` birthday `+` tobe `+` on the `+ `ngày (số thứ tự) `+` of `+` tháng.

`3.` My little brothers played chess with their friends last week.

`@` Dấu hiệu nhận biết: last week `→` Quá khứ đơn

`star` Quá khứ đơn:
`(+)` `S` `+` `V``{(-ed),(column 2):}` `+` ...
`(-)` `S` `+` did `+` not `+` `V` `+` ...
`(?)` Did `+` `S` `+` `V` `+` ...

`4.` Reading lots of comic books is fun.

`@` lots of `+` Danh từ số nhiều

`star` Hiện tại đơn với tobe:

`(+)` `S` `+` is/am/are `+` `N``/``adj`

`(-)` `S` `+` is/am/are `+` not `+` `N``/``adj`

`(?)` Is/Am/Are + `S` + `N``/``adj` `?`

`\text{#Rain}`